Here is a "Team Sonic Racing" (an upcoming game) tee. This one was seen at PAX and E3 worn by people manning the TSR booth. As you can see, it is labeled with the word "CREW" on one sleeve, making it probably not a 'public' tee, but a company one.
The front has a simple Sega logo on one side, while the back has the full color

Team Sonic Racing logo. This could be obtained at the online store Poshmark in 2019 as well. It is likely to be uncommon.