Here are some interesting Sonic sweatpants.
Interesting in that...their only Sonic content is his name written between two stars on one leg. The rest of the pants just have black checkers in a stripe all the way up the leg. The pants themselves are a mottled medium gray, with elastic & draw-string waist. The name is written in white.
So, this sort-of-counts for a 'subtle Sonic', item. There are no pictures or art of him anywhere. But, it is this same fact that also makes them kind of boring? Like maybe they can be paired with a shirt or something but...
The pants are also 21 dollars, which seems rather steep for kids/teens size pants. It is rumored they had a pair of shorts with them (like a 2-pack) that was also a 'name only' item--but it sure wasn't attached here. (That would make the price make sense though) This is a Target 2021 item in the boys/teens section.