I am 5'6" and weigh 126 pounds. I ordered medium because I was afraid they would be very tight but they are not. I will return them for the size Small. If you're close to my height and want a tighter fit, go down a size. Medium is fine if you want a looser fit. I like that the V-neckline isn't so deep that my chest dangles when I I lean. The material is thick and stretchy. I find they make me hot and sweat a lot easier than a cotton shirt so that's disappointing. The only real quality issue is the black shirt. After the first wash I noticed red fibers coming out of the shirt. I'm assuming it's elastic. It's hard to tell from the photos, but it definitely looks weird. I plan to order a size S and will probably try to get the package without the black shirt.
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