I am between a small or medium on bottoms, depending on the design.
I bought the size small, and the body portion fits close to a size medium (plenty of coverage front and back on me).
The straps, however, are way too big for the size!!
The size Small fell off of me, as the straps were way too long.
I had to pinch the straps in on the sides just to try on- to see what is should look like.
I am debating on whether to keep or return... if I think I can re stitch each of the straps to be shorter. Elastic is a gamble on trying to alter, as it won't have the same "give." Bummed it doesn't fit right out of the box.