Sha (紗) is the older hand woven predecessor to Ro fabric. Sha fabrics often made up the summer kimono, kosode and yukata of the Heian period down to today, and which are normally adopted globally most popularly in the Haori which employ their innovative fabric potentials for summerwear. Woven using the staple Karamiori weave, the weave allows the wearer to reveal the underneath fabric with subtle hinting and shading from the transparency of the weave and width of the eyes that Sha has over Ro. Twists in the warp threads allow larger eyes than Ro eyes, creating emerging patterns in Sha designs.[1]
Sha began to be made in the Heian period by hand, for the elites of Japanese society to wear as formalwear in the sweltering heatwaves of July and August which Sei Shonagan believed to be unbecoming of feminine propriety.[1] Unfortunately, it was difficult to dye the natural fibers used to make handmade Sha, so Ro was created in the Edo period to do so.[1] By the Meiji period, this was made redundant as Sha fibers could be made using machines and the nature of these light designs made it easy to make fashionable pictures of ladies in revealing hitoe. In the modern day, Sha is made by machine, creating Monsha ( 紋紗 | Pattern Sha) which is made using a mix of Leno and Plain weaves, but most often regular Sha is worn daily by monks.[1]
Bibliography
[1] https://rosha.jp/faq/02_about_ro-sha/ro_sha_chigai/
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