I LOVE this!
Even though I'll never be the one to wear crop tops, this is toooo chic to pass up.
Take an old black tshirt that's at least a size to big for you so the arm holes are loose. Put it on and mark where you'd like it to "crop" off at. Take it off, cut it at the crop mark then cut the sleeves in half starting at the top of the shoulder on both sides. Lay it flat and take a bunch of safety pins and pin it together using as many as you wish to achieve w/e look you're going for. Then pin the bottom of the shirt all the way around so the pins are hanging off. TA-DA!
Courtesy of: nodiscount