Cross-Fitting is when you must use “bra math” to adjust the size you are wearing.
The equivalent of any size can be found by going up one band size and by going down one cup size. Or by going down one band size and by going up one cup size.
For Example: If you wear a 40DD
Go UP one band size = 42
Go DOWN one cup size = D
Therefore, 40DD = 42D
Going up and down band and cup sizes can be confusing, but one does effect the other.
To change one you must also change the other.