this is the dumbest argument. i don't care how self assured you are, the issue isn't about how you feel about yourself, it's how other people feel about you -- and dressing in an alienating/bizarre way can have real consequences. for example, there are some very conservative teachers in my grad program. if i dressed in head to toe julius they'd look at me askance. and their opinion on me has a real, lasting impact on my prospective future.
I know you are a respected member here so I tread lightly... but this is bullshit. Some of my most formative moments came from people who dressed/ looked/ acted differently from me. It's all about attitude. If you wear all Julius and you act like an arrogant depressed asshole then that's how you will be perceived. But if you wear all Julius and you are charming and fun and positive...then you wiill be perceived that way.
My favorite people in life haven't played by the rules. Fuck conforming.