So unfortunately, I only received the 18R, but I think I would have more comfortable in the 20R. I was 4 months post partum in this photo. I have a very wide ribcage, so I would say if you are about a 38 D in your bra size go for the 20 so you are more comfortable. It fit and was perfect in every other way.

Blush Drape Gown

Adrianna Papell

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Size Worn: 18R

Usual Size: 18

Height: 5' 6"

Weight: 240lbs

Bust: 42DD