Old Navy coupon March 17 (3-17)! A 30% off Old Navy coupon March 17 (3-17)! The Gap Give & Get coupon is back, which means a 30% off Gap / Banana Republic / Old Navy coupon March 17 – 20.  The Old Navy coupon can be used multiple times, and Gap gives a 5% donation to charity each time! Snag your Old Navy coupon! ***Enter to win a $50 Old Navy gift card here!