This was an amazing find. This is from the "昭和" "showa period" . The "showa" period is from 1926-1989. This is called "型紙" or "katagami".
Katagami are made of multiple layers of thin mulberry paper which are bonded with a glue extracted from persimmon, which makes a strong flexible brown coloured paper.
This katagami was used for "katazome" which is the method of dyeing fabrics (kimonos) using a stencil and a resist paste. The resist paste was made with rice flour and when dyed, the dye didn't