I originally purchased a Medium since I normally wear a Medium in a shirt, but it was way too big. So I went back & ordered several Smalls. I love the way they fit! If you're a woman looking for a good swim suit cover up, order a size up. I used heat vinyl on all mine with a heat press, & they turned out great! They have been washed several times & still look new. These are great quality tanks & soft. And they come in a variety of colors! Can't wait to order more!