It's rather too bad this shirt is for toddlers only...the Neo-Classic art and design is fun for any fan, not just really small ones. It says "Awesome" across the top, & has 4 rectangles each with a character portrait. The art is all neo-classic so it looks fresher & has new poses. You can see waving Tails, (probably) hand out Sonic, fists-together Knuckles & surprised Amy Rose. Anything featuring classic style Amy is pretty uncommon so she's fun to see, even if the bright pink doesn't exactly go with the quite orange tee. This is a summer 2015 release, but where is it sold?

Here's a funny slogan-(ish...) tee. The blue tee has only white printing & art for the classic winking Sonic face. It says "Faster than...." then a line and "(your name here)" Which is appropriate, because Sonic is faster than everybody. Notice the paper tag in the corner, this is by Bioworld, which proves they are still making shirts / still have the classic license. This tee appears in 2016, and is likely a boys/teens size. (note proportions) But where is it sold?

This tee from JC Penny is in the Men's area, so it'll fit anyone. It's a dark navy blue, with a dull white Sonic face large at the top of the chest area. It has that 'weathering' faux wear to the design, though it is a modern style art. Written across the side of the face/spike is the word "Sonic the Hedgehog", but in Japanese. (The "Sonic" part is bigger, with the rest of it as a smaller sub-line.) This is probably a 2016 item, appearing in the winter. This should be about 10 to 12 dollars, depending on sales.
Notice the tag here, the one with classic Sonic & Tails, and that it's different from the above JC Penny tee, so they've got at least 2 companies making Sonic merchandise for them in winter 2016.

Another toddler item...another plaid item.
Why do they keep giving toddlers plaid? This late 2015 set has some plaid shorts & an aqua blue tee top. The top has a dark collar and the slogan "Play at your own risk". The art has Sonic, Knuckles and Shadow, with the modern logo under Knuckles' feet. The shorts don't appear to have anything to do with Sonic, they're just plaid in gray, charcoal, a blue to match the shirt & thin red stripe.
It's kind of too bad the shirt is so small only, the slogan is fun & the less-common poses for each of the characters makes it a little fresher. Where could you find this set, and how much did it cost?

Here is a shirt from Target in 2016. It's a gray boys/teens tee with a slogan "Speed is my Specialty!" It's a classic style tee, but it's also somewhat unusual for the art they've chosen. It's an older Japanese sotck art where Sonic is crouched/determined. This was mostly only used in Japan, and appears on very few USA products. (Is this the first shirt to use it?) If you're looking for something classic style yet still fresher, let this be a pick for you! (Target tees are generally reasonably priced, too)

Here is the white version of the originally red/blue "Step it Up" toddler size clothing set. This has exactly the same modern CG designs for the clothes, but the material colors are varied. Here, the shirt is white with blue collar & red thread accents & the shorts are blue with white border & red thread accents. This was probably released around the same time as the original.
It's interesting to see a toddler size set getting more than 1 variant in on a release. Clothes like this for super little kids (who don't have much input in what they want to wear) generally just do ok/not amazingly well. Still, the design is good, and it's nice to see designed shorts/pants as well. It's just too bad it's so small.

This 2015 tee has light and dark blue stripes all over. The Sonic grapic on the front is jumping-twist modern Sonic. He's in front of his name, written vertically in white. It isn't weathered, the word/font is striped through. The shirt looks nice, & the stripes give it added interest though the design is fairly standard. Where was this sold?