The beards are definitely worth their weight in gold.
The knee caps are foam inside, I personally wouldn't. One of the reviews I read mentioned them being a little uncomfortable against skin.
An adhesive backed sheet of felt would fix them up for kiltation I suspect.
Oddly enough, it's said they fit in most kneepad pants pockets too.
We play Pistol and we encourage the Few despite the discouragement of the Many.