Impatient Sonic from the back of a classic shirt. This is another submission from a site contributor! Foot-tapping Sonic seems to be taking up most of the back of the shirt

Another one for the sports fans, here is Sonic with a basket ball for some reason. This is a Pajama shirt (were there pants?)

Here's another 'big head' shirt, but with a design wrapping in from the side. The eyes on this one are a bit pointed at the top, and it's not your typical stock art pasted onto fabric type design. Consequentially, this shirt is rather uncommon.

Another sporty entry with this base ball jersey. It is button-down like the other from the previous page. Supposedly, there were several of these done. This is the "Dude with a Tude" and a classic, but well done stock art.

A simple tee with 'fade' design where the stock art has been modified to be holding a fistfull of crayons. Wacky 80's style letters spell "SEGA!" up the side.

Look at this interesting entry! It is a Soccer type jersy thing, however, it was billed as "For Girls". Yes, its on a female type mannequin, but the cut also looks like it is genuinely for a female. This is unusual because there is almost NOTHING Sonic that is ever marketed 'just for girls'.

This is an odd one.
A giant screen-cap of the Marble Garden zone background (complete with score!) from Sonic 1 on Genisis. They then added a not-so-well-drawn stock art, much like the Sonic Trading Cards from Topps. Notice the spike trap chain does not go all the way up, despite the continuation of the pattern. UK has identical version of shirt.