my guess would be Strangefish's tutorial over at C2F's Art School.
Do it Yerself Nudity by Strangefishit's done in PSP, but it's the tutorial that i learned from and i've only touched PaintShop Pro a few times, so you can easily take it and apply it to Photoshop.
i can't think of too many other full costume tutorials that go in depth other than BA's (great tutorial) and Strangefish's. i'm sure there are some, but i can't remember any other than the ones i listed.
This Post was from: http://heromorph.com/heromorph2/newbb/viewtopic.php?forum=4&topic_id=1289&post_id=13447