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plus size, back rolls, prone to under-breast chafing. currently wearing 42DD from Catherine's. under bust 38.5". what size would fit best?

Is this padded?

If this fits larger, is it truly in the band size - indicating to go down one band measurement eg.,40 to a 38, OR is it the cup that's too large?

I'm 34" under bust and 41" at fullest bust. What size will fit?