It is amazing what a little creativity can accomplish; on the Assassin's Creed forum, I ran into some youngsters who fashioned their own costumes long before Windlass got involved; some of them of course were very rudimentary but there were others that were quite detailed and when you realized all they had to work with was cardboard, aluminum foil and cast-off sheets of material, it was very impressive.
One of those kids actually managed to make the retractable hidden blade out of cardboard and tin foil and it actually slid in and out of the harness with just a quick motion of his arm! Yea, I was pretty quiet on those particular threads having nothing to offer along the same lines.