I had a hard time finding nice looking things as well. I found that Gap jeans were ok, but after a while didnt give me the support I needed, opted for Mamas and Papas low cut and a belly band and their over the bump jeans in the end. Very comfortable and washed up nice.
In general I went with Mamas and Papas for most of my clothing, they fit well, have a nice 'normal' look to them and washed up well. Couldnt find better bras anywhere else either! And, if you end up needing a swimsuit, theirs fit and stretch really well.
Gap had loads of t-shirts,and some work clothing but they made me feel a bit frumpy as I got bigger.
H&M had some nice basics like vests for under things they fit really well, but other things were a bit... hum...
Jojo Mama Bebe has alot to choose from but sometimes their patterns were a bit odd. They did have nice summer vests though and a few jumpers that were nice. The thing I loved the most were the nickers though! Soooo comfortable and washed up without shrinking! Mother Care's pants have a huge tag at the back and shrank quite a bit... not sure if it's all of them or just the type I got, but I had 2 packs and they did the same thing.
I tried to buy things from the nice on line shops that I saw in all the mags, but when I'd get things home they didnt always fit and I wasnt up to sending things back after a while. But, if you're willing there are so many options!
Good luck! Hope the rest of your pregnancy goes well!