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Sonic the Hedgehog Clothing & T Shirts Store
Sonic clothes are both great, and abundant.
However, they have mostly been the domain of retail chains like Sears and JC Penny. Giant retail doesn't really do online ordering of super specific things (read Sonic / character shirts) very well. However, more selections now appear online...so if you can't get to a mall (to avoid shipping costs) or your local store just doesn't have the selection you want, you can now use the SonicGear Store!
When clicking the links, the retailers should all present you with sizes to choose from. All shirts seen here are also available to be viewed on the regular pages of Sonic clothing.
This shirt is presumably made by TopHeavy Clothing.
However, it hasn't been found at regular (offline) retail yet to know for sure. It has Sonic X style peace-sign Sonic, but done in a single line which changes rainbow colors for an interesting effect. There isn't really another shirt that resembles this one, making it an interesting one to own.

The shirt at the right has a photo that may come and go. For some reason the store can wreck their link on this item box periodically. It is actually the Blue Spatter Ring Shirt found on USA Modern Clothing. With spatter effects becoming more popular, this one is still all right due to the mostly blues pallette and Sonic's not-too common pose. If you own this shirt, do write in to say who has made it!

The shirt at left is generally referred to as "Sly Kanji" shirt though it does not actually use kanji (the letters at the bottom spell out 'Sonic' but they're in hiragana instead) This shirt goes all the way up to XXL (not all of them do) so chances of it fitting anyone are pretty high. Pressing the link should make size options appear on the page that comes out.

The shirt at right may also be found at Kohls, but if you can't find it there, you can always get it here. It's listed as 'mens' so do watch the size as it can get big fast. It is quite grunge-style with Sonic colored all outside the 'lines' and a rough gray roller-paint like background. Be sure to view the close up provided to see the exact texture.

This shirt to the right is another grunge style. It also employs 'fake wear' effects on the design. The art is a Sonic Adventure 1 era stock piece with him on a skateboard, and the red dusty background added in.

The left shirt is the somewhat sought-after fitted tee that is usually from Spencers Gifts. Can't find a Spencers? Grab this one. It's listed as a 'fitted/juniors' tee (meaning it's considered to be for girls, which is unusual for whatever reason) but with the dynamic pose, all light blue scheme and huge art it still makes for a unique piece.

Another somewhat elusive girls tee.
This is again listed in the Juniors, and features more fake wear texture to the designs. "Boys Play Games" is the slogan, with the classic standing Sonic stock art. It is still among some of the first items the USA made specifically for female Sonic fans.

The 2nd tee at right is somewhat 'fitted', however, it is likely that anyone could wear it. The design closely resembles the Target Exclusive classic style Sonic shirt, as well as one sold at Hot Topic. Can't find or fit into either of those? Give this yellow one a try.

This is the 'Hot Topic Hoodie'
Once exclusive to Hot Topic stores, it's now seen online. However, it is pricey as a full size adult sweatshirt. (HT also had it for a quite a bit of money as well) If you weren't able to get it there, now is a good chance.

"Speed Freak Tee"
Seen around on ebay, usually opening bids at 20, here you can get this adult sized tee for about 16.00. It comes in all adult sizes from small to XL, so it should fit anyone without a problem. It has a black checkered flag background and the old slogan "Welcome to the Next Level" in script at the bottom. It is always dark gray, and decent for anyone who still needs classic-look items.

A double-meanings slogan shirt...
This is seen on USA Sonic Clothing, but you can just get it right here. Though billed as a 'girls tee' the cut is not an extreme 'for girls' cut, with the only difference really being that it's longer and has small sleeves. Available in all adult sizes (lists as Juniors but any size S to XL there should fit anyone) The slogan is "I (heart) boys who move fast" with classic Sonic added among the block text. It does have the 'fake wear' effect on the design.
Wacky internet humor rules this shirt which says 'This is how I roll', with classic spinning Sonic stock art. This shirt is made by FifthSun, a relative newcomer to the shirt scene in 2010
At left is the checkered grunge background shirt which was reportedly at some Kohls stores. If you can't find it here, this button should have the lowest price. The background is all gray checkering, with the 'fake wear' that seems popular now, but uses SA1 style Sonic stock art.
At right is a rather cool Sonic & Tails themed mens' hoodie. Since it's mens, it'll most likely have sizes to fit everyone! However, it is pricey-er than a regular tee at about 40.00 It's all blue, with modern style Sonic & Tails in a series of yellow ring designs. The sleeves even have white stripes.
The shirt at left is sometimes called 'vintage hog' shirt. It's all Sonic blue with classic stock art 1-finger waving Sonic on it. The design is nice and large, with a bold classic logo at the bottom. There's no faux-wear to the design here, so you get a good, clean classic look. Good for if you don't already have something similar.
At right is the "Built For Speed" Sonic shirt seen on USA Recent Clothing. It has Sonic done partially in hot green grid-lines with a technical looking background. This is one of the more creativly styled modern shirts. It may list as 'youth' but is more likely 'teen', so be sure to look at the sizes.
At left is the 9 Sonic Faces shirt. This has 9 squares each with a different classic Sonic face inside. The shirt is yellowish and the material should be thin/vintage styled cloth. This may be seen at Hot Topic stores, but if you can't find it there, this button should work.