These run TWO sizes smaller! I only weigh 98 lbs and small bustline, but the underarm area of tee dug into my skin and was so tight it flattened my tiny chest!  I had seen the other reviews so ordered a few in med rather than small, but am returning them. If they are so tight when brand new, they would  be even smaller after washer and dryer.  If you want these, I'd say order two sizes up.