I was able to make my Popeye arms from a few pairs of ladies stockings and some pillow batting. Wrap forearms with batting and hold in place with masking tape.
Some finesse is required to ensure your muscles aren't lumpy. Tape up arms to hold the batting in place, then cover forearms with stockings. I used two stockings for each arm to help hide the masking tape and white batting.
Use a marker to draw on Popeye's famous anchor tattoos on each forearm.