I saw this dress in the store in the coral color and tried it on. i am 5'4", 34b, and slender to athletic build. i wear the size 2 in this dress. as far as sizes go for retailer, i would say it is tts. the slip fits like it should and the dress is flowing. it is not see through as were some of the other silk dresses this summer. it feels so comfortable and makes me feel pretty. it is a flowing dress and meant to fit that way. i waited for it to go on sale and the day it did i purchased it!!!