This is new for the upcoming season.
http://www.thebeerbelly.com/
It's supposed to be worn under your striped shirt. Note that you can use it during pre-game and time-outs, and also between quarters and at half time.
This is how it is used:
http://secretbeerbelly.com/video/CNNbeerbelly.wmv
It's guaranteed to make your games more enjoyable. Coach yapping at you? Sneak a sip and belch in his face. Nervous partner? It's a great way to relax him/her.
Certified for both NFHS and NCAA usage.
NOTE: IAABO recommends usage of diet coke only.