Step 1: Cut out sleeves in the shape you want it. I like my workout shirts to show my sports bra and back so I cut all the way down the shirt, as shown below.
Step 2: Cut slits up the bottom of your shirt and pull all raw edges to make a fun little fringe. (TIP: when you pull raw edges it will fold over the edge making it look more neat)
…and whoolah, you have a fun, cute workout shirt! Quick and easy for all of your oversized shirts.