Editors Closet is my biggest shopping discovery this year so far! I just can't recommend it enough. Their brands, the choice and most of all the prices are so much better than on any other site.
Not only you get those amazing clothes and amazing prices - but also coupons (yes!), here is one I found:
I love Banana Republic for their simple yet chic style. Great for work, but not your boring office clothes. They ship internationally, so if they're not in your country, you can still get their great fashion!