Segaworld often made really detailed, nice items. They put a lot of thought into the design, and this boy's jean shirt is no exception. The front has 2 pockets, each with embroidered characters. Sonic, Tails & Sally are seen peeking over the seam and watching the Coconuts monkey badnick who is standing on the other pocket.
The back is plain, save for a single small embroidered tag in the middle, with Sonic on it and the words "Gotta Juice" below it, which is from the SatAm Sonic show that this Segaworld liked so well. The buttons down the front are even all relief-metal Sonic faces! They really didn't skip any details on this shirt. Likely produced in 1997.