If you want to make a Boro cloth that resembles the authentic stitched Boro cloths of the past, this fabric stitched with the Olympus Sashiko thread,
MC-T6 INK BLACK sashiko patch boro mending collection - fabric
Sashiko Fabric
Boro Textiles Kits, Patterns and Fabric Swatches for Boro
Boro Sashiko Fabric
Soot Black Cloth for Boro & Sashiko - A Threaded Needle
Boro Sashiko Fabric
Soot Black Cloth for Boro & Sashiko - A Threaded Needle
DIY: Sashiko Needlework Sampler Cloth — Loop of the Loom
MC-T6 INK BLACK sashiko patch boro mending collection - fabric