The Git logo by Jason Long has a very permissive license (CC BY) that allows practically anything as long as the author's name is mentionned. And to be extra sure, I also asked him and he confirmed :)
I've ordered numerous shirts from Redbubble and I really like them: tshirt quality and lastability (?) are excellent, there are plenty of awesome designs to chose from, and it's dead easy to upload your own. Ditto.
I've set the Redbubble commission to a low percentage to keep the t-shirt as affordable as possible (I don't give a flying damn about making dollars of money from this, I primarily made that for myself). What are you waiting for? I'm sure a Git t-shirt would look nifty on your Christmas wish-list! :)
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