The buttons assorted to my belt buckle for a perfect combo. Use a thread the same eye's color as your princess's favorite pet for the best effect.

N.B. : I made a quick test print, and sadly the holes are a bit tight or closed even with a 0,2 with FDM, but the cat's head is only 16mm approximately, maybe try scale it up a bit for a child garment or use a small drill or heated needle to reopen them