This t-shirt is so cool: if you have an old one, you can make it in 5 minutes. You will need only an old t-shirt. Cut the sleeves off. Start a little bit lower than the sleeve, the lower you go the more you show. Use the left over sleeve to cut a string for the strap. Cut shoulder seams. If you have a v-neck don’t cut the collar. For a crew neck, you can cut the collar off. Gradually cut the shoulder seams off starting from the sleeve. Cut as such so it forms a gradually line to the side seam. Fold the sides and then fold over the top part. Sew along where the pin is (look at pics). Read here how to finish the tee.