I am 5'5, 198, 36DDD athletic build and I usually wear a Large in FN items that are true to size. I ordered this dress in both a size Large and Medium and returned both because of the loose fit. I have since ordered a small. The quality of the dress is great and well made. It is heavy as expected and wasn't easy to put on, but once on, it's worth the fight! There is a dress included that goes underneath, which is great. If you are looking for a loose fit like the model I still suggest sizing down 1 size. However, because of my cup size, I wanted more emphasis in my waist and I've sized down twice. She's a beauty.