Upto 75% Off On Everything On Old Navy/Gap + Extra 50% Off Clearance on Gap
GAPPERK, GAPTREAT, 30% Email Signup coupon at Old Navy, 30% Email Signup at Gap (both are separate coupons and do stack)
Don't forget to use your eBay gift cards as well! (credit: @wilson881)
I ended up ordering clothes worth ~$600 for about $220
Furthermore, Old Navy also has $12 jeans (just for today!) and the 30% Old Navy coupon stacks (so a single pair of jeans costs just $8.40!)
Be quick though as the stock is rapidly going out of stock!
p.s. Banana Republic also has 50% off on their sale items and the 25% Off Banana Republic Email coupon stacks as well! - Banana Republic has had even better sales in the past though