Step 3: Prepare the victim
Chop the sleeve off the shirt.
Cut a piece of the cylinder to appropriate length to fit inside the sleeve. I used a foam pool-noodle, a pool toy.
Stretch the sleeve over each end until taught, using tape to assist if needed. This shirt had a small, stretchy cuff, so I only had to tape one end.
If you want, prepare the second sleeve in the same manner in case you a)don't like the way the first one turned out, or, b) want to use a second wooden leg, either on you or someone else.