Well, the stabilizer's job is to prevent horizontal stretching, not vertical buckling. So I don't see how the stabilizer, even if it's deeper, is going to help. What you'd really need, if you wanted to do this, is to prevent pleat-parallel (vertical) buckling. I suppose that adding something that would stiffen the kilt along a line from the top band to the bottom of where the loop attached would do it. Might even consider a strip of boning - it's only about 1/4" wide, and placed vertically, it would sure stop buckling.