You've probably seen examples of sashiko--learn about its history and cultural significance in this brief history of sashiko in Japan!
Pocket Guide to Sashiko and Boro Stitching
Sashiko for Beginners: The Ultimate Guide on how to make sashiko embroidery Japanese quilt patterns with Projects and pictures (Paperback)
A Brief History of Sashiko in Japan
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Is Sashiko Art? The origin of Sashiko as Folk Art - Upcycle Stitches
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A Brief History of Sashiko in Japan
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The History of Sashiko - Repair, Decoration, and Martial Arts