Relevant to this discussion of how the Saltire kilts are created, there's a 50" Saltire kilt on Ebay just now, and you can see that the elements are spread out further apart than usual (there being gaps between all the "bars" of white), and that the Saltire doesn't extend the entire width of the back of the kilt, with a few ordinary pleats on each side past the end of the Saltire.