In 2020, a new company gets a Sonic license, and uses it to make this PJ set.
It's "Komar Kids", and this pajama short sleeve top and pants set appears in Target stores in winter 2020. It's actually a 3 piece set, there is a pair of generic yellow shorts clipped behind the top that you see here. There's nothing Sonic about them, though. The set features an all-over print of modern Sonic faces, starburst shapes and gold rings. The front of the top has running forward modern Sonic as a nice large design. The cuffs are all yellow & the background is a pale blue.
This is made of a nice-feeling soft fabric. What's too bad though, is that it's little kids only. The largest size would probably be only for 10 year olds or so...so chances are you can't fit into this. The ring shaped tag says Komar Kids on the back & has a CG Sonic portrait on the front. That yellow large tag warns you that the fabric is treated with fire-retardant material. (Fire Retardants are under debate as to whether they're a carcinogen or not / whether they are worth the risk of wearing it vs the risk of actually setting on fire---so perhaps its ok that this doesn't fit)
This should be about 16.99 in Target.