Size up. I'm normally a medium in tops, but with the bodysuits, I size up to give me room in the crotch area. The fit is perfect and comfortable. The white is SLIGHTLY see-through. Barely. so you'll just need to wear the right colored bra. I'm a 36 C in bras. I'm 5'6 1/2. 170 lbs.29-inch waist. I'm pretty evenly proportioned, carrying most of the weight in my lower half for reference purposes. Hope this helps. ♡