Segaworld Sydney is playing with the pocket again!
These playful embroidered tees for kids were only sold at Segaworld Sydney, while it existed. This time, Sonic & Tails are shown in the pocket of the red shirt, while 2 coconuts monkeys try to climb up the side of it to get in. Sonic looks like he's pushing them away, while Tails watches. The whole design is embroidered with thread. You can see a little square "SWS" tag there on the edge of the pocket, as well as the cloth tag in the neck of the shirt. This should be from around the early 90s, likely not long after Sonic 2 was released.