If you have a large bust and want to give the illusion of smaller, these shirts have that effect, which I love 5'4"; 39-27-39 and the regular small is perfect for me. Starts tight but these shirts stretch out with wear. Medium starts out fiting well but eventually gets too baggy in the waist and sh...ows a sliver of the top of my bra since I'm borderline petite (the scoop is too tall, drops down too far). The small scoop is high and tight enough not to show anything and stays form fitting without being uncomfortable. It looks like a body suit but without the hassle. The double-lining smooths everything out and holds you in (The petite sizes are perfect on arm length but lose length in the body so I prefer regular smalll. Though the arms in regular are not ridiculously long or anything) Please make more colors! I wish it came in chocolate brown and olive green...