CLOSING YOUR SLEEVE WITH A THREAD
SEIF 7
Before buttons were put on sleeves to close them, sleeves were closed by pulling a thread that was sewed into the edge of the sleeve; similar to a drawstring. Rabeinu Peretz prohibits to close such a sleeve on Shabbos, since it is considered part of the Malacha of sewing. Though planning to untie and loosen it at the end of the day, still, sewing for a day is still considered sewing.
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