Do you have a Club Monaco near you? I find their quality to be very good for sweaters. I don't fit so well in their pants or dresses and jackets (not tall enough), but I wish I did. Wish they made petites. The clothing is all very well made, at a decent price point, and it's fashion forward too.
I find Eileen Fisher quality to be consistently excellent. Expensive, but you get what you pay for. I just added two sweaters purchased on sale and they are well made and feel very yummy! Only problem is that I'm barely in a PXS ... which is incentive to NOT lose weight or I will be sized out.
Next in line for sweaters is Vince. Expensive but the quality is great. I have two Vince sweaters going on a couple of years, no pills. Oh and their leather jackets are to die for. I like their other items but they don't fit me so well since I'm a petite.
As for BR, their outlet store is horrible so make sure you're not shopping at one of them. I do not buy their handbags as I find the quality generally poor. You do have to sift but you can find some great things. In fact I own a lot of BR stuff. I hit BR in the Fall specifically for merino sweaters as they normally do a great job with those. I don't have much luck with their jeans, but their Sloans are good and if I needed a suit and dress slacks, this is where I'd go first. You also have to be choosy about their tops but yes you can find good quality.
AT ...you have to be very careful, and if ordering online, be willing to return. I have found a lot of their "online exclusives" are hit or miss. I've received items that smell horrible, are unlined, cheap fabrics, poorly cut, bad seams, etc. Since more and more of their petites are online only, my strategy is to go to the store to feel the fabrics and check out the quality before ordering the petite version. That said, when AT gets it right, they get it right. Some lovely well made items.
LOFT you have to be even more careful.... it's practically flash fashion. I do love their softened shirts though. Good deal for the money, and hold up well in the wash. And their pants and jeans fit me well, so that's now the first place I look. I also love their denim jackets. They have a lot of cute blouses in general but they are polyester which just makes me sweat. I prefer natural fibers.
Talbots... yes, you can find good things at Talbot's too.
Madewell is ... made well! Unfortunately the fit is off for me, or I'd shop here often for basics.
I just found a shop yesterday called Francesca's. Unfortunately they don't make petites, but their clothes were super cute and in yummy fabrics. If only I was taller...