Lollapalooza 2011 just wrapped, and despite the torrential rain, it produced the requisite victories to make the experience another categorical success, with live highlights including Crystal Castles' punishingly great set to the Arctic Monkeys' much-discussed victory lap in the rainbow. Of course, there's always a style story to accompany every musical motion made. In the spirit of celebrating 20 years of Lolla, we look back at some of the festival's most memorable stylistic and visual milestones. These are the performers whose manner of personal presentation express something specific and special about at the particular moment and mentality in time they have come to encapsulate. Dressing is a dialogue, and these looks – funny, strange, subtle but informative – tell us a lot.