FYI, my measurements are 40" chest, 28" waist and 37" hips. I got a large. It works but the laces are out pretty far and I hope this information is helpful for you.  The fabric is really nice.  The latches are almost impossible to get latched but easier than the over the bust style I bought. I was able to get this on by myself by loosening the back laces a lot, putting it on and doing the latch in the front and then reaching around to the back and pulling on the center of the laces. I was even able to tie it.  The straps do look a little strange in that they don't lie flat with the back let out. I wish I'd gotten a little larger size because of this the rounded front that is wear your boobs would lie is a little to narrow for my chest but doesn't really give you that "pushup" look like you'd think, but a bra will work underneath.  I do love how it feels on my back. I'm a "sloucher" and this will definitely remind me to stand straight