Evans I find are overpriced and crap quality - how on earth do you manufacture pairs of jeans where ONE LEG shrinks in the wash?! They traded for so long on a captive market that they didn't have to bother much with. Their trousers in particular are made for total apple shaped women - I'm big but with a tiny waist in proportion to my body (well until I got up-duffed) - so they're particularly useless for me!
Next do up to a 22 I think - tend to have to order online, but I like their stuff, their delivery's excellent and also one of the few places that do some plus size maternity things. They're also not tiny fitting - the 22 trousers I've got (I'm generally a 22/24) are nice and roomy and to be honest I could have gone down to a 20 comfortably. Had fallen out of love with Next but rediscovered them in persuit of maternity trousers and I'm impressed and will prob keep ordering clothes from there when I get unbumped now... also helps we've got a clearance branch round the corner from us!
Asda - I get quite a lot of stuff from George - not had much fail me from there - have some fantastic jeans that I need to say goodbye to since they're more hole than jeans and I'm going to miss them sooooo much.
Matalan now have the Rogers+Rogers stuff - I don't find it as good as when it was the chain in its own right, and I find it slightly small fitting - but it's got some nice things in there, and if you live near a clearance Matalan - you can pick up things like a winter coat for £3 which was nice and bargainous.