Official chart
Official Knix size chartBrand sizing guide
Knix Bra Size Guide
Knix mixes traditional band-and-cup bra sizing with its own alpha-size system for wireless bras. Use this guide to compare your Wearavo starting size with Knix bands, cups, plus-size alpha labels, and style-specific fit notes.
Last updated August 17, 2026. Data checked against current Knix product and collection size guides.
Quick answer
How Knix bra sizing works
Knix does not use one sizing system across every bra. The WingWoman Contour Bra uses a traditional band and cup picker with bands 28-48 and cups A-H, while many wireless styles use alpha sizes with plus options for fuller cups.
Traditional
Band and cup sizes such as 34DD or 38G.
Alpha
Letter sizes such as S, M, L, XL, XXL, and XXXL.
Plus alpha
The same band zone with more cup capacity, such as M+.
Band and cup
Knix traditional bra size chart notes
The WingWoman Contour Bra size guide asks for a snug underbust measurement, then a full-bust measurement. Its band chart maps underbust ranges to bands 28 through 48.
| Underbust range | Knix band |
|---|---|
| 23" - 24.75" | 28 |
| 25" - 26.75" | 30 |
| 27" - 28.75" | 32 |
| 29" - 30.75" | 34 |
| 31" - 32.75" | 36 |
| 33" - 34.75" | 38 |
| 35" - 37.75" | 40 |
| 38" - 40.75" | 42 |
| 41" - 43.75" | 44 |
| 44" - 46.75" | 46 |
| 47" - 49.75" | 48 |
A cup
Bust is about equal to the band number.
B cup
Bust is about 1 inch above the band number.
C cup
Bust is about 2 inches above the band number.
D cup
Bust is about 3 inches above the band number.
DD cup
Bust is about 4 inches above the band number.
E/DDD cup
Bust is about 5 inches above the band number.
F cup
Bust is about 6 inches above the band number.
G cup
Bust is about 7 inches above the band number.
H cup
Bust is about 8 inches above the band number.
Wireless sizing
Knix alpha sizes and plus sizes
Knix wireless charts often group A-DD cups in the base alpha size and E-G cups in the matching plus size. This is useful when your band feels right but the cup needs more room.
| Knix size | Band | Fits cups |
|---|---|---|
| S | 32 | A-DD |
| S+ | 32 | E-G |
| M | 34 | A-DD |
| M+ | 34 | E-G |
| L | 36 | A-DD |
| L+ | 36 | E-G |
| XL | 38 | A-DD |
| XL+ | 38 | E-G |
| XXL | 40 | A-DD |
| XXL+ | 40 | E-G |
| XXXL | 42 | A-DD |
| XXXL+ | 42 | E-G |
Fit notes
What to check before choosing a Knix size
- Start with your Wearavo size, then open the chart for the exact Knix style.
- If a wireless alpha size feels tight in the cup but right in the band, compare the plus version.
- For smooth T-shirt coverage, prioritize molded or smoothing styles over low-coverage bralettes.
- For workouts, use Knix sports styles instead of everyday wireless bras.
Style guide
Popular Knix bra styles by need
WingWoman Contour
Traditional band and cup sizing, side coverage, light lift.
Revolution V-Neck
Alpha sizing, wireless support, smooth everyday profile.
Shape & Smooth
Wireless molded cups and smoothing side wings.
Catalyst Sports Bra
High-impact support for workouts, separate from everyday sizing.
Shop carefully
Shop Knix after checking the exact chart
Use Wearavo for your starting size, then match the exact Knix product chart before ordering. Affiliate links may earn a commission at no extra cost to you.
FAQ
Does Knix use normal bra sizes?
Some Knix bras use traditional band and cup sizes, while many wireless styles use Knix alpha sizes such as S, S+, M, and M+. Check the size picker on the exact style before buying.
What does the plus sign mean in Knix sizing?
On Knix alpha-size bras, the plus size usually means the same band range with more cup room. For example, M and M+ can share a 34 band range, but M+ is intended for fuller cups.
Does Knix run true to size?
Knix fit depends strongly on the style. The WingWoman Contour Bra is marked true to size on the product page, while the Revolution V-Neck Bra notes that it starts snug and molds to your body.
What cup sizes does Knix support?
The WingWoman Contour Bra size guide lists band sizes 28-48 and cups A-H. Some alpha-size wireless charts group A-DD separately from E-G.
Should I use Wearavo or the Knix chart first?
Use Wearavo to get a starting band and cup size, then compare that result with the specific Knix chart for the bra you want. Brand charts and fabrics can change the best final size.
Which Knix bra is best for a smooth T-shirt look?
Start with smooth wireless styles such as WingWoman, Revolution, or Shape & Smooth. Choose based on neckline, coverage, and whether you prefer a traditional bra size or Knix alpha sizing.
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