I wanted to see if anyone else got screwed over by Old Navy, Gap, or Banana Republic when they changed their return policy and didn't tell anyone. They should have posted it on their website where people would actually see it, or print it on the receipt, or email everyone in their customer base. Customer Service told me to write it to the head of Gap Inc. Here's his info:

Toby Lenk
President, Gap Inc. Direct
Gap Inc. Headquarters
2 Folsom St.
San Francisco, CA 94105

I also plan to file something with the Better Business Bureau. Here's the link for the San Francisco chapter that would handle the complaint: http://www.oakland.bbb.org/

I invite everyone who has experienced a similar issue to write to Toby Lenk, call customer service, and write to the Better Business Bureau. If enough people complain, they'll do something about it. I also noticed there is a blog here, with people who had similar experiences:
http://www.loobalee.com/blog/gap-inc-quietly-changes-return-policy-no-more-free-returns/