This is a cute little design. Not sure what those white ghostie dudes are specifically, but they’re all trying to get in to that faux pocket. Or maybe they’re trying to get out. Maybe the name of the shirt Forest Hitchhikers indicates that they were trying to get somewhere, so they hid in the pocket of a human’s shirt. Once they got to where they wanted to be, they decided to hop off, and that’s exactly where we see them now.
Design by thehookshot.