If the 13 oz were a tartan that would look good pleated to the stripe and the sett size wasn't TOO big, I'd pick that one in the 6 yard. The kilt maker would have the option to pleat it to stripe or to 'the best pattern they can' where on the 16 oz 5 yarder, the kiltmaker will HAVE to pleat it 'to the best pattern they can'.