This is perfect for repurposing an old t-shirt or a classic crew-neck tee. It's fairly easy and gives your shirt a really unique and edgy look. This tutorial comes from the creative people at TrendHunter Fashion.
All you need for this project is a crew-neck loose-fitting t-shirt, a zipper that is long enough to go across the entire shoulder-length of the shirt and a needle and thread (you can use a sewing machine instead if you are savvy with a sewing machine) or fabric glue.
Cut the t-shirt all the way across the shoulder of one side of the shirt. Pin the zipper where you want it to go. Then sew or glue it to the fabric. Repeat on the other side making sure the ends of the zipper meet in the middle of the shirt.