In reply to Gavin Moore:
It's a bit basic but the DMM Alpine will go up to bigger than the size you are after.
I'm just now getting down to a L (Thanks slimming world) and for years I've used the alpine, it's not pretty, it's not got a lot of loops, but it gets the job done and will go over pretty much anything. There's a reason it get's used by climbing centres a lot.
Oh yeah and it's pretty cheap.
I still use mine when I want to slob about in a hoody and jeans at the crag.
D.