Step 1: Cutting pieces 1 & 2
There are 4 pieces to this shirt. Three in the front and one in the back.
Starting on the front top section fold over the shirt so you just see piece 1.
Cut the piece out 1/2" larger than the original. This shirt was tight in the arms so I extended the length of the armpit to the shoulder.
Flip piece 1 over and cut a copy. This is piece 2.