Here's a cool tee for the 20th Anniversary celebration. It's a white tee, with a good portion of the Sonic cast on it. The 20th Anniversary logo appears in the top corner. On this shirt you can see, Eggman, Rouge, Shadow, Blaze Cream, Cheese, Knuckles, Tails, Amy & Sonic. But…
Here is a Pajama/PJ top with a nice modern design. It uses silvertone ink for a starburst behind jumping Sonic. This may have been released in more than just Australia.