Here's a selection of more creative sweatshirts...thanks to Knuckles!
The first one is all red with a 16 bit style Knuckles sprite (facing sideways/profile which is unusual) & the circular slogan "No Time For Games" as well as S&K's year of release. This one has no hood & is just a long sleeve sweat shirt. The next is a bit of subtle fun that's done pretty much right. It's a red hoodie with JUST Knuckles' chest crescent white mark on the front. That's it. No branding or logos or slogans. ONLY fans would know what the shirt was, which is great. It doesn't need anything else. It could also be used as a bit of a fan costume of some kind, when paired with other items like the Knuckles fist plush gloves.
The 3rd is all black with the title "Lock On", which doesn't make 100% of sense with the graphic. It's Knuckles but surrouneded by the chaos emeralds & also his debut year in S&K which was 1994.
The 4th is kind of hard to see, but they've used this graphic several times on other items & it's the "Emerald Club" line art. It's in white for the black tee. It's a decent application for the art & looks good large on the front.
The last 2 are just variants of each other, one white & the other black but with the same army-green color for the text and small graphic. It's a military chevron type thing over the word "Hedgehog In Training". These, of course, are for Sonic Forces where everything seems really wierd and boring and military for whatever reason. All of these are 2018 selections.