Here's a cool tee for Team Sonic Racing!
This shirt appears as the game gets ready to be released in 2019. It's a plain, all black tee with a design on the upper chest area. The background has a 'checked flag' type pattern, but notice how it goes behind the race cars and morphs into the lines/dots at the edge of the curving race track like shape.
The racers featured are Sonic, who is in the lead in his car, and Shadow behind him. They, and their cars are all thin line-work. The only ink used here is gray. The flag/track combo background of its thick shapes contrast with the thin curve lines for the characters and cars. It's actually a pretty classy graphic with some real thought put into the design! The way the cars are 'posed' also gives a bit of a sense of speed. This is an interesting shirt, which is for sale at Sega Shop Europe for €15,99 – €16,99 depending on size.