A few years back I bought a couple of rather inexpensive PV kilts. They have held up great so far, but recently I have found it getting harder and harder to maintain crisp looking pleats. I automatically thought that a quick spray of starch during my post-wash ironing would help resolve the issue. However, I don't know how well the kilts would handle the starch.

I know that poly-viscous is polyester/rayon blend and there shouldn't be much problem in terms of the fabric itself. But would it negatively affect the pleats? Would it make them too stiff or ruin the swish? Also, should I spray the inside, the outside, or both? Will the spray leave a film?

I usually use the historical method of starching as most of the starch I use is on cravats, collars, and the odd shirt for reenacting. Even though spray starch is sort of alien to me, dipping my kilts in boiling water just isn't practical. Any advice is welcome.