I have been wearing this style of swimsuit for 3 years now. I am obsessed with the comfort, coverage and colors. I have purchased both a M & a S in the past. I find most one pieces to fit me rather short. This one fits just right. The S is nice and snug. Since it offers no bust support you can wear it with a bikini top/sport bra below. I am a 34 C and I can get away with no bra underneath but I do prefer with. The size S is flattering and keeps “the girls” in place fairly well. The M I find becomes to loose when wet. I picked up this turquoise blue one for less than 1/2 the price I’ve paid for my other 3 suits. This is a solid color so maybe that is why it is cheaper. I get endless compliments in these swimsuits. Wash with delicate detergent and hang dry, otherwise colors fade.