I normally wear a medium in misses tops. Based on the reviews, I bought the next size up available, which is an XL plus. I can never fit plus sizes even at my largest and this fits fine. So if you are plus sized, you might be wary of this top. To help those of you around my size, I am 54, 170 lbs, and pear shaped. My waist measures about 34 at the smallest and 38 at the largest. Its stretchy so that part doesnt matter so much. I wear a 34DD bra and you can see in the picture what that means for how tight the top band is. It actually isn't squeezing me in half! My strapless bra kind of sucks so thats the main problem with the lumpiness in the boob picture. Hope that and the pics helps you figure out what size to buy!