I have a leather jacket that gets a lot of wear, in all types of weather, and still looks pretty new. Actually, it looks too new for my tastes. After nearly three years it's finally starting to show a little wear(very little) and in another year or two might have that "lived in" look and feel I like. That's why I've worn them for the last 15 years...they last, they work in most conditions, they'll take an ungodly beating, look better with a bit of wear and tear, and unless they get really filthy they smell good!

I can't say anything about leather kilts though. Never owned one, and at present I have no plans to. I can see how they would be good in chilly and drizzly weather though. I'm sure they last forever. Maybe someday I'll try one.