For casual clothing I recommend Gap. I was just on their website and could have bought almost everything on it. Depending on how strict the dress code is at your workplace, a lot of those pieces could double for things you wear to work. If not, you can definetly use it for fun everyday clothes.
And on the topic of fashion: in the Sept. issue of Shape magazine there is a fantastic piece on the 25 items that every woman needs in her closet.
