Majority of the cash shop's contents are 9 years worth of Seasonal Event rewards and old promotional reward stuff.

If you enable the "Online Store Exclusive" filter the various categories, it hides all the Seasonal Event stuff. And even there will be some outfits you shouldn't buy as they're gender locked, most specifically the NPC outfits.
Additionally on the outfits, they're often rather questionably designed for when it comes to Miqo'te, Au Ra and Rrothgar as the people designing the outfits don't seem to know that races with tails exist in the game.