To enjoy this discount at Aeropostale, you will need to have a printer since it is a printable coupon that can only be used in stores. And from what I understood, it didn’t look like you can simply show the coupon on your smartphone to the cashier.
You can use the below link to print this 15% off coupon and redeem it in store before the end of July. Have a look at the lookbook by Chloe Grace Moretz, a young 15 years old actress, there are some pretty good ideas in there. Right on time to grab some clothing essentials and pimp up your style for back to school a bit.