This is an old paper card with an embroidered Semamori back protection pattern, probably practiced by a child.
 
Semamori back guard is a pattern that was decorated on the base of the neck and back of a kimono from ancient times as a means of exorcism.
 
The set includes 4 paper cards.
 
Measures: 12cm×19cm (4.7in ×7.4in)