This shirt is a take-off on the Sonic 3 Genisis/Megadrive box art. It's been given the once-over though, with added shine, eye-detail and more shading. This defenetely has an effort put into the design, and may of come out around Sonic 3.
Here's a nicely done tee for Sonic 3. That's not faux wear you see, it's actual wear/krackling of the design, as the shirt is old and was used. It uses the promotional art for Sonic 3 where the 'scene' shown (burning forest, hidden Knuckles, Eggman's fire pod) is contained in the number 3. Tails is lifting Sonic over the action, and "Sonic" is written in red repeatedly for the 'background' to the full color art. Because the art was well done/nicely shaded, it looks great here as a big design on the front of the tee.
An interesting sweatshirt with the "Hedgehog With Attitude" slogan again. It says "Sega" in the little oval, but it's difficult to read. This is a well-made looking item, with colored stitching and stripes for the sleeves. The art is trying...but at least it's nice and big.
This is an easily recognizable fraze from SatAm Sonic the Hedgehog show, but how it got on a European shirt is unknown. This may have also been available in the USA or other regions, but it's unknown.