This still doens't help with the question of tweed, tartan, serge, other forms of twill, (all worsted of course).

I am picturing saving up for a dedicated leather forging kilt. If it doesn't get too beat up in the smithy it might be a good casual kilt to wear with my leather bomber jacket, or is that too much leather. Hmm, I'm getting images of a leather kilt and jacket on a motorcycle.