Since Sinespace, the upcoming Unity-based virtual world (a proud NWN media partner!) just released a bunch of free clothing templates -- more info on the official blog -- here's a video from lead developer Adam Frisby showing you step by step how to design clothing from those templates.
The free templates include 78 individual clothing items you can customize however you like. Also, Adam tells me some pretty cool upgrades to Sinespace fashion are coming soon.
As always, if you have questions for the Sinspace team, post them below and I'll nudge them to answer!