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The coupon will net you 20% off.
Adult style clothing is included in the tax free holiday sale.
You can use it online too with code ONBIG20.
Don't forget Old Navy has their seasonal 75% off clearance sale going on right now as well.
Children's clothing: shorts, tees, tanks and polos are all $5 each.
Here's the link above if you need to copy and paste in your browser:
http://view.email.oldnavy.com/?j=fecf17707162047e&m=fe9e13707564037f74&ls=fe8a10717c6707757c&l=ff66107575&s=fe901071716d077870&jb=ff2d1074746d&ju=&EV=ORETAILET08012013&DI=60208842&CD=ONNC_OPR