It does cause break down, well it always did my cammies. but I still got 3 1/2 years out of them. I don't own a soild kilt (yet) but if/when I do I will be all about starching it. I would use Sta-flo liquid starch, maybe 1 part warter to 1 part starch. that will make it real crisp but not positive that it will cure the curl eventualy.