Depends how I'm feeling.
Either I'm feeling lazy so I wear a tank top and sweat pants (even in the summer).
Or I'm feeling good so I do this thing where half my clothes would be considered formal (except I'm doin' it wrong) and the other half informal and it looks kinda weird but I like it.
My favorite outfit that I wear is a bright orange, long-sleeved, button-down shirt untucked on one side and unbuttoned on the top and bottom, an off-white, v-neck undershirt, a really vibrant red tie that's a little too loose and off center, a white belt on black cargo pants, a pair of shiny, black, leather, high top converse with a bit of red in 'em (but still with a white rubber sole), my gold chain around my neck (as always), my thick-frame black glasses, and my dirty blonde hair spiked up just high enough that you can tell I did it on purpose.
And that looks pretty weird to most people but that's the way I do it.