I just made myself an x-kilt and I used almost exactly the same measurements you're talking about. I had an 8" overapron, and I made the underapron long enough to reach my hipbone on my left. (Sorry I don't remember the exact measurement.)
I waited to set the left edge of the underapron until I had nearly everything else done (short of adding the waistband and belt loops) so I could wrap it around myself and adjust the width of it based on how the rest of the kilt turned out.
David












Bookmarks