Footy Addicts T-shirts
You could sell 2 different colours for let's say £20 and get 2 matches for free, as an example.
1. It will give you exposure and visibility
2. It will solve the problem of playing with the tees.
3. It will solve the prob of playing with the tees smelling like rubbish after someone else has used it or when it wasn't washed from previous matches.
4. It will define 2 colours to wear even though not everyone buys the T-shirts
5. It will increase customer engagement with the brand.
6. It will position your brand.