Cloth OTMs generally aren't very effective, I'm afraid. The best you could probably hope for is a gauze-y bandage type material, wrapped tightly around the head several times. It would probably need to be uncomfortably tight if you didn't want it to slip off though - and it still wouldn't really stop the wearer talking unless you used a lot of mouth packing underneath.
I think cloth OTMs are more just for looking good. If you like your OTM gags effective, stick with tape
