Long ties. The longer the better.
Our school had a strict uniform code -- your tie had to be long enough that the fat bit at the front covered the thin bit at the back without you tucking it into your shirt, or you'd get a detention -- as a result of people's ties getting increasingly shorter over the years. When they started cracking down on it, a couple of people in my year began wearing their ties progressively longer and longer until they were almost at knee-level. Within a month, everyone was doing it, from the littluns in Year Seven right through to the people who were getting ready to leave.
When one girl in my year sewed two ties together to make a five-foot monstrosity that trailed on the floor when she walked, the deputy head had a screaming shitfit in the middle of the canteen so mighty that I'm pretty sure there's still a scorch mark on the ceiling