yes, be sure to check with a trademark attorney on that one. The NFL are absolute nazi's about protecting that mark. I tried to get a license to make team themed bikinis a few years ago, not an easy organization to approach. They have extreme power with that mark in the marketplace, and endless money to make things happen in their favor. Although you have a great logo, I wouldn't think they'd let you get away with it... before you put your money into it, get with the attorney first. That'd be my advice anyway.
Larry Garman
Dangerous Curves Swimwear