If you dont like how someone dresses you are more than within your rights to shoot them in game...PS Even if you arent impressed by someones custom armor they are still paying and helping the game and their ability to stand out ingame is their reward.
NOTHING shown has been outlandish or quirky. Honsestly though if there is and people pay for it...Thats their right to wear it...Do what you would do in real life when you see someone wearing something stupid...Ignore them or laugh at them.
EDIT: And to all the people who are saying "OH IT BREAKS THE IMMERSION BLAHDEBLAHDE BLAH...". First of all stupid crazy stuff happens in combat all the time...