If the Saltaire kilt with the White "X" on the FRONT apron is the one you're referring to (NOT the one in Hamish's pics), then why not ask Robert from RKilts or Steve from FK or Richard from UK to make one for you?

This way, you KNOW it would fit and you've heard LOTS of good things about their Customer Service and you can tweak the design to include pockets and stuff if you want.