It helps to have a universe where the outfits are described in great detail. Bujold's Vorkosigans (space opera - but with a huge range of cultures, the primary one is roughtly 18th century nobility, including family colors, but with "nearby" galactics that push the limits of cosmopolitan...) For that matter, CJ Cherryh's Invader et al are partially to blame for my growing my hair long enough to braid :)

Maybe this is something where Aging Fans can direct, harness, and fund the penniless Collage Fans. (There might be some lessons to take from SCA teaching and guild efforts, though they may just be "reasons why this is even harder than you imagine" :)

There are probably annoying IP issues for anything published by big houses (ie. selling Star Trek(tm) items for example) which is why making them for yourself is a lot safer...

_Mark_