To start, I am 5'6", 125 lbs, 32D bust, 28" waist, 39" hips, so I could have gone with either the small or the medium. I opted for the small because of the smocked back allowing for stretch. When it arrived today, I had to go back and look at the picture on the website, because mine came with double straps on each side, and the website shows only single straps, although the description does include the fact that it does have double straps. I feel like the double straps make it look a little busy. I may try tying them together or just folding one set in on each side to only have the single straps. Even with the smocked back, it is still a little tight in my chest and flattens my boobs. It helped some when I switched my bra for Cakes. This isn't the first issue I've had with Flying Tomato dresses doing this, which is why I have sized up in the past, but I figured with the smocked back it would be fine. It's still a really cute dress, and part of me wants to keep it, but I may send it back.