Grunge band? Kurt Cobain wore a kilt on several occasions that I remember and he's about as grunge as it gets. The guys from Pearl Jam used to tie their flannel shirts around their waists giving them a kilted look too. The lead singer of Korn (and my fave band) wear a kilt onstage all the time. He's also a good pipe player too boot. Wear it. The other guys in the band may take your lead and get themselves kilted as well. But if anything, you'll be able to break the "bass player never gets the girls" curse ;)

BTW -My parents now "summer" in Grand Rapids. Actually, I was born in Michigan myself. Not sure when I'll make it back though. I'm sure soon since my folks are always bugging me to bring their grand children up.