Cut off the collar of your shirt (i cut about 1/2" into the material. On the side with the buttons and 1"on the other side to create a neckline)
fold in half to make sure the cut is even on both sides
Flip shirt inside out and fold over the cut edge, pin, and sew a hem.
flip right side out and your done.
Yup. That easy. This shirt is reversible and seriously the cutest most comfy thing ever.