Im thinking the SRP logo and website on the front (like the jackets) and then on the back a slogan if you guys decide you want one. Remember, its on a hat though, so the shorter the better.
taking a few ideas from others you could do something like
Established xxxx
Got SRP?
Got Razors?
Smooth Operator
Living on the edge
You get the idea, funny, easy to read, and probably under 4 words.