This is a Sonic pajama set, with dark blue varying background. It has a button front long sleeve top, with long pants. You can see the logo there in the back of the shirt and pants. See the big SA1 pose Sonic that takes up half the shirt? That's the only art used for the whole set, so those repeating Soncis you see everywhere, are just more of that same one. It's a little odd to use only 1 pose for a scattered pattern like this. Still, the 1 large design helps break it up a bit on the top. This is like a teens item, but where do you find it and how much is it?
Notice how the pattern for the pants is shared with the shorts above. The same company must be doing all of these.