Theory makes good quality jeans and dresses. Below is a pair of jeans I recently purchased from NM during their big sale.
The jeans are flare style. They're soft and comfortable to wear. I like how I can sit in them and not have to adjust the waist band, because that's embarrassing when you're caught.
They fit true to size and don't practice vanity sizing. That's convenient because it makes ordering them online easier.
For example, with Banana Republic I never know how their pants will fit. A size 00 in BR is sometimes too large, whereas I wear size 0 in theory and it fits just right.
Also, these jeans are the ideal length for my 5'4" frame, no hemming!! I appreciate Theory for this reason. I can buy their jeans and then wear them out of the store. Ideal for vacations when you just need to buy a pair of emergency pants.