Band Strap

I wear a 32b/c, but the band always rides up in the front. What size am I?

I wear a 32B or C depending on the brand, but it is really annoying because I have to make the straps really tight so the band fits better, and then the underwire rides up :/
I know I need a smaller band, but I'm not sure how bra sizes work.
I'll have to order online, but I'm not sure if I should I try a 30B, 30C, or a 30D? Thanks!

Get measured. You are probably a 30 B or C but get measured. You shouldn't be a whole different cup size -even if it is a different brand.

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