To start it off i use an old tshirt i never use and cut it on one side so i have a blank slate to wrap.i put tape on blank shirt slate so i have a nice soft lining inside.
Step 1: stencil and cutting
once i had it all nice and smoothly taped i trimmed it to be all straight edges. i made a stencil out of posterboard for the leg holes i used a plate and drew half the circle. cut that out and go to a private area and try it on to see how comfortable it is. you will probably need to trim the corners around the legs so you dont get poked