The online store that only serves Mexico called "Cuidado Con El Perro" (translates to Careful With The Dog--but is meant to mean 'beware of the dog' but lacks the negative connotation/danger connotation word for that) starts off the Sonic selection with 5 different shirts.
The first is a navy blue but it has 'bleach rubbing' where the color is brushed away from the fabric with bleach (Turning it a faded orange as dye is removed) before the getting ready to run Sonic art is added. The art itself doesn't appear to be wethered.
The next is a gray tee with Sonic popping up out of a gold ring above the logo. It has colored bands for the collar & sleeves. The bright blue has the Japanese 3 point stance Sonic but really really large for a big impact.

The only modern one is a black long sleeve shirt with portraits surrounding 1 full body shot. The last is a variation on shirts that have been in the USA for a while, It's an all navy-blue version of running classic Sonic with his name spelled out in Japanese under it. (Look at that one model though, he is the smuggest of all--but why) Each one is about 130 to 240 (probably) Pesos though it uses a dollar sign. This is a reasonable enough price & the shirts feel quality. They're all also titled some variation of "Playera".
It's a good selection in adult & teen sizes with some thought going on for the designs.