Turns out the bass design was from the rock band games (apparently used in Scott Pilgrim as a direct reference to rock band)
Watched Scott Pilgrim earlier today on the old Blu-ray and got to thinking I liked one of the t-shirts he wore.
Tried looking online for one but couldn’t find any official ones. In fact, I could only find one and it was on Zazzle.com. I’m not sure bout their tee quality and it was a bit expensive so i decided just to rustle up my own (cheaper to buy!)
Haven’t seen this on RB, it might be there but my searches didn’t bring it up.