This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
Snuggle up with Rei Ayanami on this bed sheet! Measuring about 200 x 110cm, it features a big illustration of Rei in her snow-white, snug plugsuit, with a terribly cute look on her face. This game-prize item from Sega makes a great wall hanging, too--and don't forget the matching Asuka sheet, linked below!