School may be about to start, but it's all about the adults over at Old Navy . Beginning today, all us grownups can save a nice 20% off styles just for us with coupon code ONBIG20. This is our chance to pick up looks for work, play and everything in between. For the kids there's the Back to School Sale with prices starting at just $5 on hoodies, tees, dresses, uniforms and more. Get in on the coupon savings soon, it expires 08/04/2013. Sale's ending is unknown.