NISSA Size Guide: US Size Conversion, Body Measurements & Dress Fit
Choosing a NISSA dress size starts with two useful references: the size conversion chart and the body-measurement guide. Use the conversion chart to understand the label, compare your bust, waist and hips with the measurement guide, then check the construction of the dress you want to wear.
This guide is specifically for the NISSA clothing brand at BTK COLLECTIONS. It explains Romanian size labels, US equivalents and the fit considerations that distinguish a tailored pencil dress from a full-skirt or stretch-velvet style.
Your usual US size is a starting point. Your measurements and the individual dress provide the more useful buying information.
How to Use the NISSA Size Guides at BTK COLLECTIONS
Conversion and measurement charts answer different questions. Read both before selecting a numbered size.
| Reference | What it helps you decide |
|---|---|
| International conversion chart | Identifies equivalent Romanian, US, French and other labels. It does not describe the dimensions of a finished dress. |
| Body-measurement guide | Lets you compare your bust, natural waist and hips with the measurements associated with each NISSA Romanian size. |
| Individual dress details | Explain the silhouette, fabric, lining, sleeves and closures that affect how the selected style fits. |
Use the NISSA conversion and body-measurement tables below alongside the individual product’s fit information. The body chart here is the inch chart selected by BTK COLLECTIONS for this guide.
NISSA Size Conversion: Romanian Sizes to US and French Sizes
The Romanian system is labeled RO. French sizing is labeled FR. Keep those labels attached to the numbers: an RO 40 and an FR 40 represent different rows in NISSA’s conversion chart.
| NISSA RO | US equivalent | French FR |
|---|---|---|
| 36 | 2 | 34 |
| 38 | 4 | 36 |
| 40 | 6 | 38 |
| 42 | 8 | 40 |
| 44 | 10 | 42 |
| 46 | 12 | 44 |
| 48 | 14 | 46 |
| 50 | 16 | 48 |
Why “NISSA Size 40” Needs a Sizing System
NISSA RO 40 corresponds to US 6 and FR 38. By contrast, FR 40 corresponds to RO 42 and US 8. The number alone is insufficient for a dependable conversion.
When selecting one of the featured dresses, read the numbered options with the accompanying NISSA RO guide. If a listing or garment label uses a different system, confirm that system before applying the table. Conversion also does not guarantee that your usual size in another brand will fit identically.
NISSA Dress Body Measurements: Bust, Waist and Hips
The tables below use the NISSA inch measurement chart provided by BTK COLLECTIONS. These numbers describe body measurements, not the circumference of each finished garment.
NISSA Body Measurements in Inches
| RO size | Bust (in.) | Waist (in.) | Hips (in.) |
|---|---|---|---|
| 38 | 34.5 | 27.5 | 37 |
| 40 | 36 | 29 | 38.5 |
| 42 | 37.5 | 30.5 | 39 |
| 44 | 39.5 | 32 | 41.5 |
| 46 | 41 | 34 | 43 |
| 48 | 42.5 | 35.5 | 45 |
| 50 | 44 | 37 | 46.5 |
The inch measurements are reproduced as provided by BTK COLLECTIONS. The centimeter table below is calculated from those inch values using 1 inch = 2.54 centimeters and rounded to one decimal place. RO 36 appears in the size-conversion chart, but body measurements for that size are not supplied in this measurement chart.
NISSA Body Measurements in Centimeters
| RO size | Bust (cm) | Waist (cm) | Hips (cm) |
|---|---|---|---|
| 38 | 87.6 | 69.8 | 94.0 |
| 40 | 91.4 | 73.7 | 97.8 |
| 42 | 95.3 | 77.5 | 99.1 |
| 44 | 100.3 | 81.3 | 105.4 |
| 46 | 104.1 | 86.4 | 109.2 |
| 48 | 108.0 | 90.2 | 114.3 |
| 50 | 111.8 | 94.0 | 118.1 |
Compare your body directly with a body-size chart. Do not add extra inches to your measurements first. If you receive finished-garment measurements, assess those separately, allowing for the intended silhouette, usable stretch and room needed for movement.
How to Measure Yourself for a NISSA Dress
Use a flexible measuring tape and wear the undergarments you expect to wear with the dress. Stand naturally, breathe normally and keep the tape comfortably against your body without compressing it.
| Measurement | How to take it |
|---|---|
| Bust | Measure around the fullest part of your bust and across your back, with the tape level and your arms relaxed. |
| Natural waist | Measure around your natural waist, often near the crease formed when you bend sideways. Do not hold your stomach in. |
| Hips | Stand with your feet together and measure around the fullest part of your hips and seat. Check the tape position from the side. |
| Additional proportions | Consider shoulders, upper arms and shoulder-to-waist length when the dress has a fitted bodice, close sleeves or a defined waist seam. |
Measure twice and record the units. For flat measurements, garment comparisons and more detailed instructions, read How to Choose Your Dress Size Online.
Worked Example: Choosing a NISSA Size From Both Charts
Imagine a shopper with a 36-inch bust, 29-inch waist and 38.5-inch hips. These hypothetical measurements match the RO 40 row in the body guide.
- Find the measurement row: 36 / 29 / 38.5 inches points to RO 40.
- Read the conversion: RO 40 corresponds to US 6 and FR 38.
- Check the dress: Identify where the bodice, sleeves, waist and skirt fit closely.
- Check proportions: Consider shoulder position, waist-seam placement and hem length.
- Resolve missing information: Ask about the specific size if the listing does not address an important fit concern.
RO 40 is the chart-based starting size in this example. It does not establish the finished dimensions or guarantee the same fit in every NISSA design.
Now imagine the shopper’s bust and waist match RO 40, but her hips match RO 42. In a pencil dress, hip room becomes particularly important. In an A-line dress, the skirt may provide more room, but the lining still needs checking. The next decision depends on the dress’s construction.
Does NISSA Run Small? Understanding Style-Specific Fit
There is no useful blanket instruction to size up or down in every NISSA dress. Begin with the NISSA chart and interpret fit notes for the individual style.
A tailored pencil dress follows the hips more closely than a full-skirt dress. A fitted woven bodice may feel different from stretch velvet. An asymmetric neckline adds another consideration: it needs to remain comfortably positioned as you move.
The black bow-neck dress below is described in its listing as true to size. That guidance still calls for checking the NISSA chart and the fitted bodice. It should not be extended to every dress in the collection.
Spandex or elastane content does not tell you exactly how far a dress will stretch. Fabric construction, stretch direction, lining, seams and closures all matter. Do not choose a smaller size solely because the fiber label includes elastane.
BTK COLLECTIONS NISSA Dress Construction Comparison
These three dresses illustrate why size conversion is only one part of choosing a fit. Each has a defined upper body, but the skirt shape, neckline and fabric change what needs attention.
| NISSA dress | Construction, measurements and fit checks |
|---|---|
 Red Pleated Belted Pencil Midi Dress |
Design: Red midi with a rounded neckline, pleated bodice and long pleated sleeves, fitted waist, buckle belt and pencil skirt. Back zip and back slit. Shell: 96% polyester, 4% spandex. Fit priorities: Bust, waist and hips, plus shoulders, upper arms and sitting room. The belt adjusts the waist’s appearance; it cannot enlarge the dress. Measurements: Ask for measurements of the selected size if needed. No style-specific finished bust, waist, hip or length measurements are supplied in the description reviewed. Care: Dry cleaning recommended; follow the garment label. |
| Black Bow-Neck Long Sleeve A-Line Midi Dress |
Design: Black structured woven midi with an oversized decorative bow at the crew neckline, fitted bodice, seam-defined waist and flared A-line skirt. Long sleeves, closed back and back zip. Shell: 90% polyester, 10% spandex. Fit priorities: Bust, waist, shoulders and sleeve room. Confirm lining room through the hips. Do not size down because the skirt is full or the fabric contains spandex. Model reference: Designer model wears size 36; height 181 cm, bust 82 cm, waist 61 cm, hips 90 cm. These are model body measurements, not dress dimensions. No finished garment measurements are supplied in the description reviewed. Care: Professional delicate dry cleaning; follow the garment label. |
 Black Velvet Crystal Midi Dress |
Design: Black stretch-velvet midi with an asymmetric off-shoulder neckline, crystal-square accents at the shoulder and waist, long sleeves, shaped bodice, flared skirt and zip fastening. Lined. Shell: 92% polyester, 8% elastane. Fit priorities: Bust, waist, neckline security and comfortable arm movement. The stretch does not remove the need to check the shaped bodice and lining. Model reference: RO 36; height 179 cm, bust 83 cm, waist 61 cm, hips 90 cm. These are model body measurements. No finished garment measurements are supplied in the description reviewed. Care: Professional delicate dry cleaning; protect embellishments and follow the garment label. |
Check each product page for current price, available sizes and sale terms. A size appearing in the conversion chart does not mean it is stocked in every style.
Fitted Pencil Dresses: Check the Hips as Carefully as the Waist
The red pencil dress fits closely through the lower body. Check whether the skirt and lining allow comfortable sitting and walking without pulling at the hips, closure or slit. A waist that fits well does not establish that the entire dress fits.
A-Line Midi Dresses: Start With the Bodice
The bow-neck dress opens away from the hips, placing particular importance on the fitted bodice and waist. Check shoulder placement and whether you can reach forward comfortably. A full skirt cannot compensate for a tight upper body or a waist seam sitting at the wrong point.
Velvet Occasion Dresses: Check the Neckline in Motion
For the crystal velvet dress, assess the asymmetric neckline with your intended undergarments. It should remain comfortably positioned when you sit, lean forward and move your arms. Check the sleeves and waist without relying on stretch to correct an unsuitable size.
For related construction checks, explore how to assess dress quality. For hem placement, use our dress-length guide.
Between Sizes in NISSA Dresses: What to Check
| Your situation | Next fit check |
|---|---|
| Bust and waist match different rows | Assess both fitted areas. Ask for garment measurements rather than choosing by the waist alone. |
| Hips match a larger row in a pencil dress | Check hip and lining room, plus sitting comfort. A belt will not solve a tight skirt. |
| Hips match a larger row in an A-line dress | Confirm the actual skirt and lining dimensions. Fullness may help, but the photograph cannot establish the available room. |
| Sizing up loosens the shoulders | Consider whether the style suits your proportions. A larger size may solve one area while creating another fit problem. |
| The dress contains stretch fibers | Check the fitted areas and lining. Do not assume a specific stretch allowance from the percentages. |
Alterations may be possible, but ask a qualified tailor before relying on them. Adjusting a lined bodice, embellished neckline or shoulder can be more involved than shortening a plain hem.
Ask BTK COLLECTIONS About Your NISSA Dress Size
A specific question helps us focus on the fit issue that matters to you. When you contact BTK COLLECTIONS, include:
- The product link and size you are considering.
- Your bust, waist and hip measurements, with units.
- Your height and preferred hem position.
- Your main concern, such as sleeve room, waist placement or neckline coverage.
- Any chart or listing measurement you would like clarified.
“I’m considering this NISSA dress in RO 40. My bust, waist and hips measure __, __ and __ centimeters. Could you help me check the fitted areas and confirm whether measurements are available for this size?”
A photograph of a model provides context, but matching the model’s height does not establish a size match. Bust, waist, hips and torso proportions can differ considerably.
NISSA Size Guide FAQs
What size NISSA dress should I buy?
Compare your body measurements with the NISSA RO chart, check the US conversion if helpful, then assess the individual dress’s fit notes. If your measurements span several rows, ask about the specific style before selecting a size.
What is NISSA size 40 in US sizing?
NISSA Romanian size 40 is US 6. French size 40 corresponds to US 8 in the same conversion chart, so confirm the system before using the number.
What is NISSA size 42 in US sizing?
NISSA RO 42 corresponds to US 8. Compare measurements as well as labels; the conversion alone does not establish fit.
What is NISSA size 44 in US sizing?
NISSA RO 44 corresponds to US 10. Check the relevant bust, waist and hip measurements for your chosen dress.
What is NISSA size 48 in US sizing?
NISSA RO 48 corresponds to US 14. Availability varies by style and should be checked on the product page.
Are NISSA Romanian sizes the same as French sizes?
No. For example, RO 40 corresponds to FR 38. Use the labeled conversion table rather than treating all European numbers as interchangeable.
Does NISSA run small?
Use the NISSA measurement guide and the selected style’s fit information. A pencil skirt, fitted woven bodice and stretch-velvet dress create different fit requirements; a blanket instruction to size up would overlook those differences.
Are the NISSA chart measurements body or garment measurements?
The measurement tables in this article describe the body. Finished-garment measurements must be identified separately, with the size and measuring method supplied.
What if my measurements fall into different NISSA sizes?
Check every area where the dress fits closely. Ask about the garment dimensions and lining instead of averaging your measurements or automatically choosing the smaller size.
Does a NISSA dress with stretch need the same fit checks?
Yes. Stretch may provide flexibility, but shoulders, neckline, waist placement, sleeve room and lining still need to suit your body and intended movement.
Your Final NISSA Dress-Size Checklist
- Identify the system: Confirm whether the number is RO, US or another label.
- Measure: Compare your current bust, waist and hips with the body guide.
- Assess the design: Check the fitted areas, fabric, lining and closures.
- Consider proportions: Look at shoulders, sleeves, waist placement and hem length.
- Resolve questions: Clarify missing or differing measurements before ordering.
When your dress arrives, try it with the intended undergarments and shoes while keeping tags attached. Review the item’s sale status and the current return policy, including its separate request and mailing requirements.
Explore NISSA dresses at BTK COLLECTIONS or browse the NISSA Occasion & Evening Edit. Choose with the conversion chart, body measurements and the details of the dress you intend to wear.
