Tanzen fabric, black and white check pattern

Thank you for looking.

This is a bolt of fabric for a tanzen (traditional Japanese padded jacket) that has been stored at home for a long time.
It is tied with thread, and as far as can be seen, there are no stains or dirt, so we believe the inside is also fine. However, looking from the side, the edges are dirty (discolored?). (See image 4)
The quality guarantee certificate is torn. It is a black and white checkered fabric and is cute.
Thank you for your consideration.