A-D Cup?
You should select your usual bra size when shopping with What Katie Did. Our sizes are generally in line with brands including Agent Provocateur, Triumph and Gossard.
DD+ Cup?
Please note that we are not a modern full cup brand which specialises in DD+ cups which means that all of our bras are sized traditionally: your underbust measurement and band size should not be the same. Our band sizes are designed to fit an underbust measurement 3-4 inches smaller so, for example, a size 32 is designed to fit an underbust 28-29".