Bra Cross-Sizes: Everything you need to know for the perfect fit
Does your bra not fit properly, even though you know your size? Are the cups too small, the band too loose? Cross-sizes might be the solution. Here's how to use them, with a chart and practical tips.
Finding the ideal bra can sometimes be quite a challenge. You know your size, but the bra still doesn't fit properly. Is the underband too tight or too loose, the cups too big or too small?
This is where cross-sizes in bras come into play. In this article, we'll explain everything you need to know about cross-sizes and provide helpful tips and tricks to find your perfectly fitting bra.
Basics What exactly are cross-sizes?
Before we delve into cross-sizes, it's important to understand how bra sizes are constructed. Bra sizes are made up of two components: the underbust measurement and the cup size.
The underbust measurement is given in centimeters and increases in increments of 5, for example, 75, 80, 85, etc. The cup size, on the other hand, is the difference between the bust measurement and the underbust measurement.
Important: An A-cup with an underbust band of 75 is not the same as an A-cup with an underbust band of 90. The cup size is always relative to the underbust measurement.
Benefits Why are cross-sizes useful?
Cross-sizes have two main advantages:
- Alternative when unavailable: If your actual size is out of stock or not available, cross-sizes offer a suitable alternative.
- Perfecting the fit: Even if you know your correct bra size, cross-sizes can optimize the fit for certain models and offer you maximum comfort.
Overview Bra Cross-Size Chart
Each row shows bra sizes that have the same cup volume. You can switch within a row. The band will get tighter or looser, but the cup volume remains the same.
| A-Cup | B-Cup | C-Cup | D-Cup | E-Cup | F-Cup | G-Cup |
|---|---|---|---|---|---|---|
| 70A | ||||||
| 75A | 70B | |||||
| 80A | 75B | 70C | ||||
| 85A | 80B | 75C | 70D | |||
| 90A | 85B | 80C | 75D | 70E | ||
| 95A | 90B | 85C | 80D | 75E | 70F | |
| 95B | 90C | 85D | 80E | 75F | 70G | |
| 95C | 90D | 85E | 80F | 75G | ||
| 95D | 90E | 85F | 80G | |||
| 95E | 90F | 85G | ||||
| 95F | 90G | |||||
| 95G |
← Scroll table horizontally →
Instructions How to determine your bra sister size
Let's look at the four most common problems with bra fit, and the appropriate solution using sister sizes:
Band fits, cups too small
Go down in band size and up in cup size. Example: Instead of 75B, try 70C.
Band fits, cups too large
Go up in band size and down in cup size. Example: Instead of 85C, try 90B.
Cups fit, band too loose
Go down in band size and up in cup size. This makes the band tighter while maintaining the same cup volume.
Cups fit, band too tight
Go up in band size and down in cup size. This makes the band looser without changing the cup volume.
Attention: If both the band and cups do not fit correctly, sister sizes will not help. In that case, you should re-measure your bra size.
Sister sizing is a helpful method when your conventional size doesn't fit optimally. By experimenting with different band and cup sizes, you can find the perfect fit for yourself and enjoy an even more comfortable wearing experience.
Recommendation Find your perfect bra
At erlich textil, you'll find bras and bralettes made from sustainable materials, in many sizes and sister sizes. Fairly produced in Europe, designed for maximum comfort.
The perfect bra is not the most expensive, but the one that fits correctly.










































