Erm, could i put in a word for humble Mothercare? I went along just last week to look at prams but veered thru clothes in desperation.
First off, saw terrible pile of snow-washed faded nightmare pairs with weirdy ties and buttons and pockets all over. Spirits sank to toenails. But then looked elsewhere in dept and hit the jackpot. Big over-bump panel. Boot-cut (because let's face it I ain't no Kate Moss), not too dark/not too light. A bit of slightly twinky blue flower embroidery on RH bum pocket but nothing too twee. I'm only 5ft 2in but I think they come in different lengths (10R, 10L etc) and mine are good for me (20+1). And, triumphantly, I was at least a size smaller than normal. Think they were about 30 quid.
Also have pair of pea in a pod ones lent by my sister. Under-the-bmp and i feel as if I'm being sawn in half. Not recommended.