DD is going to Year 11 prom and was telling me how she thinks it works.
Apparently some of the girls in her year bought their dresses ages ago so she has left it late and the selection will be less, there are particular shops that sell said dresses, and they ask what school so they don't sell the same dress to somebody from the same school.
"What if you go to a different prom shop?" I asked.
DD wasn't sure but reckoned the different shops wouldn't have the same selection of dresses.
Is this right? 
As an extra complication, DD doesn't actually like dresses - she's a baggy trousers and hoodie short-haired girl. I suggested a trouser suit but woe betide a middle-aged mum with fashion advice! If anybody has any ideas/links, I would be very grateful!