Banana Republic: 25% off full-priced items through Sunday, with promo code BR25OFF. Click on and print image below (make sure you have the barcode) for in-store discount.
Brooks Brothers: (This is more for the boys, if any actually read this!). 15% off, or 20% off when using a Brooks Brothers credit card. 4% of net sales goes to the Golden Fleece Foundation.
Lauren Merkin: 20% off website purchases today with promo code "TAXBREAK." LM often extends promo codes, so I wouldn't be surprised if it happens again.
This list is certainly not exhaustive, but should keep you busy for a bit. Have a nice weekend!