[Quiet Man Cometh]

The patter I used for my dolls was to fold a bit of fabric in half, cut a T shape with the fold at the top of the T. Cut a head hole in the fold, pop it over the head, and wrap the arms of the T around for sleeves, and the stem of the T around the waist and sew the sides together. Might have to cut and trim as needed but it did work. At least, it worked when your shirt was maybe a couple inches long.

Derpy does not deserve wife-beaters! He's a classy dragon.