Rave. It was big in the early '90s, had a modest moment in 2005 (the year responsible for bands like Klaxons), and now, like any timeless trend, it's rearing it's wide-eyed head again.
Think longline T-shirts, flashes of pink or tie-dye and a lot of black. While we're on the subject of the darkest color, whereas black used to mean goth, now it's a little more contemporary. Think young Dracula goes clubbing.
In all seriousness though, if you like your wardrobe to be up to speed with all the latest happenings in leather, dip-dye, tie-dye and anything that will make you look like you should be in a music video, then here you go: meet The Ragged Priest.