OK, so we have tropical weight and feather weight that are unsuitable for kilt making, and then light weight (11 oz), medium weight (13 oz), and heavy weight (16 oz) with the legendary Regimental Weight (18 - 22 oz) that are suitable.

So how much heavier is too much? I have some 26 oz on its way for a 4 yard box-pleated that should be interesting!