My mom has worsted wool suits (probably about 10 oz weight) that were made for her in the 1940s when she was in college. Still going strong (both the suits and the lady LOL). If you take care of it, good worsted lasts about forever. Mr. C at church can still fit into his father's kilt. He's my mom's age, so that kilt has to be going on 100 years old!!!

But they also doesn't wear those garments to garden in. If you kilt a lot, you'll want some 'jeans quality' kilts, too, to mow the lawn in, work in the garage, stuff like that.