I adore this dress! I actually bought the size 18 even though I would usually wear 14-16 because it was the only one left!!! I desperately wanted to wear it for a party I was heading to that was TIKI theme, and I wore a big fruit headpiece haha, but ANYWAY! The skirt is lined and full, which felt really luxe. I have size E-F boobs, and was worried about how the whole tie up thing would work, but seriously, you can just tie the chest bit up however you like it, as well as adjust the straps to get it perfect. I think it would be fine if my bust was both bigger or smaller, it gives full coverage, but you can totally adjust however you like.
It ended up being a bit of a cold night, so I wore a white t-shirt underneath, but when I tried it on without one it was awesome. I now totally want this dress in every other colour way - fab!