I'm going to rebel against your sick, facist 'no boys allowed' regime, Laddy, and post in this thread!
In the indie music scene I'm a part of, a lot of people look REALLY similar. Like with all styles of people. I think mostly everyone buys their clothes from places like topman, so I've taken to only wearing random skateboarding brands of t-shirts and hardcore t-shirts (t-shirts with hardcore bands on them.) I like dressing in the style but messing with it.
Jacket wise I usually wear sports jackets, Adidas, Fred Perry, whatever. I like it because my tight jeans and plimsolls and stuff is contrasted with the good old sporty coats.