This may sound a bit aggressive...but as far as I'm concerned wanting "uniqueness" is and inherently is ridiculously selfish. It's wanting to police what other people can look like, and frankly that's nobody's business but their own. Literally nobody wins from restricting cosmetics except for the few people who want to irrationally stand out among a crowd of strangers.

If this was a very racially segregated setting, then sure I could buy it. Outfits that are given to growing X race as a coming of age ceremony would make sense, but that is not the world of Eorzea. It's fairly recent development, but the humanoids have for the most part all come together. In fact with the exception of Au Ra and Duskwights, race is barely an attribute. You're not a lalafel or a hyur, you're a Gridanian or an Ala Migan.