It’s like a patchwork fabric cotton

We think this is the crazy patch print from SPX Fabrics' Primitive Dolls collection. A seller in Japan has the same print, matching black pentagons and feather stitching. They only ship within Japan, so you'd need a forwarding service, but an eBay or Etsy search for "SPX Primitive Dolls crazy quilt" may turn up some closer to home. Where to find it: minne (Japan): https://minne.com/items/46408038