Maybe not for mass production, but I'd totally do my own zip-up hoodie with a HUGE logo on back + small title in front (or something)
I also setup another gear outlet through Cafepress.com you can check out here. They have hoodies ect, but I can't guarantee sizes as it's all through them. I simply setup the logo on which products... BlackBerryOS.com Gear Store
If there is nothing there you like, PM me and we can try and work something else out.