How can I source user generated designs for t-shirts for one of my communities?

One of my communities wants t-shirts! I was thinking of sourcing user generated design & then having a vote - could be ongoing - anyone have experience w/ this?

I would prefer no trial and error in retail! Thanks in advance! Ideally- I'd like to set this up as an ongoing thing. (For the community by the community) so, I'm not sure if I want to use campaigns (like tee-spring) as an option, but I'm all ears!