This long sleeve shirt & long pants are only available in little kids sizes. The design element here is the use of black/white (or mostly gray, actually) portraits of Sonic. Modern Sonic appears twice on the top, but the background is rectangles with the gray portraits in them. This repeats on the pants with tiled portraits, but it appears they're all upside-down for some reason? Also that red blob behind colored/large Sonic on the top comes across as sort of a heart shape. Sleepwear has a reputation for busy & loud design (counter-intuitive, perhaps) and this set is no exception.