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Easy Jeans from USC, The comfort fit style offers a larger cut in the leg and slightly wider bottoms.
edit: that's the bottom of the leg not the arse
I've had some success with Fat Face trousers (this problem seems to extend to work trousers for me - it doesn't look reet proffessional if you end up flashing your undies because the ony trousers that fit over your hip/thighs have a mahooosive waist)
Also like my O'Neil jeans... but had to get them in the sale.