Don't know what Flylady's opinion would've been but I think I would've stuffed them with newspapers to see if some of the mustiness could have been eliminated. If so, if I didn't want to wear them anymore, I'd have donated them to a thrift store, etc. But, now, I have a feeling they're "sleeping with the fishes" in the words of a Godfather character.
By the way, they looked pretty good after 15 years. You know what's going to happen now, don't you? They'll be back in style in another 10 years and you'll be kicking yourself.
Isn't that how it always is?