I've been a size 12 on bottom half for as long as I can remember however now they feel baggy and droopy. I recently bought myself a pair of size 12 jeans from Next and they feel fine when I first put them on but within an hour I look like a bloody gangster with them hanging off my hips, crotch near my knees 
I've never been able to fit into a size 10 though but have just ordered a pair for curiosity sake. I'll be gutted when I can't fasten them but wish me luck anyway!
(is there much of a difference between a 10 and a 12? anyone else inbetween sizes?)