The Sega Shop online store is going wild for winter wear in 2018.
With these additional 6 long sleeve sweat-shirts, you get an only red & black selection. The first is a Sonic & Tails simple logo black zip-front black jacket type. It has the 25th Anniversary logo high on only one side of the chest. It's just white & not that large.
The next 2 shirts are hoodies, both with the "uprising" side's logo in the middle of the chest. They're just a variant of each other, red with tan logo or black with red logo.
The next two are more subtle still...with just the hero side star hidden among some paint stripes. These are variants also either red with tan star or black with red star.

The last shirt only comes in black with a darker gray design. It's the Eggman Empire / villain side logo with hidden(ish) villian character outlines & a spray paint/shadowy effect. It's interesting to see how subtle they got with some of these, and then to also find a 'bad guys only' sweat shirt. All of these are 35 to 40 dollars each.