If it’s curved or riding up on your back, it’s too loose. You need to move down a band size.
If it does, you need a smaller size band (that's the number in a bra size; the letter represents the size of the cup). Think of a bra band as a see-saw, To keep your breasts supported, the band must sit level or low on your back. When the band begins to rise on your back, your breasts will drop. A smaller band size will rest more firmly on your rib cage and remain in place.
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