Aerie vs Calvin Klein
Two brands, two ways of grading a size. Here is how Aerie and Calvin Klein differ in system, range and fit, and which one to choose for your shape and your problem.
Aerie or Calvin Klein, in short
Aerie and Calvin Klein both label in US sizing. Aerie runs true to size in the band and true in the cup with average wires; Calvin Klein runs true to size in the band, grades small in the cup, average wires. Range: Aerie 30–42 / A–DDD; Calvin Klein 30–38 (numbered styles); XS–XL (bralettes) / A–DD in numbered styles. Convert your measured size into each and let fit decide.
Your measured size in both
Same body, two labels. Each result is your US size converted into the brand's system, then adjusted for how that brand grades. Same system, so the label matches: the fit adjustment is the difference.
Aerie vs Calvin Klein at a glance
| Aerie | Calvin Klein | |
|---|---|---|
| Sizing system | United States | United States |
| Bands | 30–42 | 30–38 (numbered styles); XS–XL (bralettes) |
| Cups | A–DDD (G in select styles) | A–DD in numbered styles |
| Band grading | true to size | true to size |
| Cup grading | true | grades small |
| Wire width | average | average |
| Straps | Standard | Standard |
| Alpha sizes | No | Yes, some lines |
| Tier | Value | Mid-market |
| Origin | US | US |
| Signature line | Real Sunnie: lightly lined and demi contour | Modern Cotton: alpha-sized bralettes, the signature |
Which to try for your breast shape
| Shape | Aerie | Calvin Klein |
|---|---|---|
| Full on bottom | Real Sunnie demi | Perfectly Fit demi |
| Full on top | Real Happy full coverage | Modern Cotton bralette |
| Shallow | Real Free wireless | Invisibles |
| Projected | Real Sunnie plunge | Perfectly Fit |
| Wide-set | Real Sunnie plunge | Modern Cotton triangle |
Not sure of your shape? Use the shape finder.
Choose Aerie or Calvin Klein?
- first bras and teen sizing
- soft contour at value prices
- cups usually feel roomy on you elsewhere
- alpha-sized bralettes for smaller cups
- fashion basics
Both are right at the same measurement. The label differs by system and the fit by grading: start from your measured size, convert into each, and let the five fit checks decide.
What each brand is known for
| Aerie | Calvin Klein | |
|---|---|---|
| Line 1 | Real Sunnie: lightly lined and demi contour | Modern Cotton: alpha-sized bralettes, the signature |
| Line 2 | Real Happy: push-up and full coverage | Perfectly Fit: numbered lightly lined and t-shirt bras |
| Line 3 | Real Free: wireless | Sheer Marquisette: numbered lace |
| Line 4 | SMOOTHEZ: smoothing bralettes, alpha | Invisibles: numbered and alpha contour |
Aerie vs Calvin Klein: answered
Is Aerie the same size as Calvin Klein?
Same notation (US), different grading. Aerie: Bands run true to size: start with your measured band on the loosest hook. Calvin Klein: Bands run true to size: start with your measured band on the loosest hook.
Which runs smaller, Aerie or Calvin Klein?
Aerie. Cups grade true to the measured difference. Calvin Klein (Cups grade small) try your measured cup and one up.
Which is better for a large bust, Aerie or Calvin Klein?
Aerie runs to A–DDD on bands 30–42; Calvin Klein to A–DD in numbered styles on 30–38 (numbered styles); XS–XL (bralettes). The one whose range covers your size (in its own system) and whose wire width suits your root.
Which is better for a small bust?
Whichever grades true or small at A–C: Aerie cups true, Calvin Klein cups grades small. Small bands need the brand whose range starts lower: 30 vs 30.
Can I use my Aerie size at Calvin Klein?
Convert first (same system, so the label carries), then adjust: Calvin Klein bands run true to size and cups grades small relative to true. The calculator above does both.
Do Aerie and Calvin Klein fit the same breast shapes?
Not identically. Full on bottom: Aerie Real Sunnie demi vs Calvin Klein Perfectly Fit demi; Full on top: Aerie Real Happy full coverage vs Calvin Klein Modern Cotton bralette; Shallow: Aerie Real Free wireless vs Calvin Klein Invisibles.
Opens HauteFlair’s own hub page; use your measured size there. HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.