All-black is sometimes difficult to pull off but cargo pants + a simple black t-shirt has the universal significance of "badass" and is practical for all possible purposes, from giving academic lectures to the righteous beatdown of unlawful punks. Did I mention it endows the wearer with an aura of no nonsense badassery?
I haven't understood the purpose of a suit so far. Tried to wear one a couple of times in my life. I looked like a haggard penguin and I suppose that's the only real purpose it serves.
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