How can we obtain these new costumes?

[TheRogueX]

Maybe it should be rare vanity gear to make it special and not common vanity gear that everyone can have for 100 gil.
Like a necklace with a nice motive and expensive gemstones versus a glass necklass

Something for rich players to show other players how rich they are.

This is perfectly OK, but there needs to BE that 100g cheap vanity gear and/or low-level craftable vanity gear for the non-rich to have. As it is, SE has basically made vanity into an elitist- (or gil-buyer-) only club. It's patently ridiculous and SE needs to get their collective head out of their collective ass.