Old Navy Deals: Buy 1 Get 1 50% off on Sweaters September 25, 2014 By: SMFMcommentShare The Savings! Today at Old NavyÂ you can score Buy 1 Get 1 50% off on Sweaters with coupon code: COZY! Ends on 9/26. This is on the web only! Plus, if you shop in-store, you can score Up to 50% off All tops for the family! Ends on 9/28.