My teenage uniform was vest top or band t-shirt, german army shirt, black mini skirt, thick black tights and german paratrooper boots. For winter, I threw an army parka or leather jacket over the top. Oh and a dog choke chain with a padlock on it as jewellery (one horsespunk lasagne to anyone who gets that reference). Occasionally in summer I'd wear old vintage dresses, but always tights and the massive boots like these:
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At 16 (for 6th form) I added some culturally questionable dreadlocks, nose and eyebrow piercings (done with a gun in a dodgy inside-market stall). And used to walk around with my bass guitar 80% of the time.
I laugh heartily at my teenage self, in retrospect.