This 2 piece pants PJ set was released in late 2015.
It has a short sleeve tee-type top, with jumping twist modern Sonic. There's a paint spatter rust colored background, yellow square portrait of his face, and the logo in the bottom right corner. But look closely! Who's that behind the logo? You can see they've added Shadow to the design, but sort of just hidden his face away down there with the logo.
The pants have various scattered Sonic arts, and the logo, on a dark blue background, in a fairly busy pattern. As you can sort of tell by the proportions of the items in the photo, this is for little kids only. (likely will not fit teens) Where is this sold? How much does it cost?