tshirt page mentions weather
https://www.torproject.org/getinvolved/tshirt.html still mentions weather, even though that's not a thing anymore.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
https://www.torproject.org/getinvolved/tshirt.html still mentions weather, even though that's not a thing anymore.