I used TOS screencaps for parts of the uniform, that's where the folds came from - I didn't draw them from scratch, or anything.
And as for tutorials - I don't use them much. Most tutorial sites have so much info it's hard to find what you want. My techniques are pretty basic, really. Masking/blending is the main one to Google for.
Thanks for the tips. I've not yet gotten into masking and blending, relying mostly on layering, blur/sharp, and opacity. I'll have to expand into those. CS6 has some terrific features, with a cool heuristic "object identifier", making it very easy to cut and paste pieces as layers instead of tediously outlining what you want. I'm still on CS2...