Quote Originally Posted by Nick
I think we can call the "belted plaid" a kilt in this context.
In that case, 1590ish is the earliest I've been able to document what I'd call a "kilt" or "belted plaid," thanks to a German woodcut from that era, although it's entirely possible that it's a kilted leine and not a wrapped and belted plaid.

(In this context, a "kilted" leine would be one that's been belted up at the waist and the hanging folds pleated by gathering them into the belt.)