Tassel

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Middle English (also denoting a clasp for a cloak): from Old French tassel ‘clasp’, of unknown origin.

wiktionary

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From Old French tassel, from Latin taxillus(“small cube”), from tālus(“ankle”).

etymonline

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tassel (n.)

c. 1300, "mantle fastener," from Old French tassel "tassel, fringe, hem; a fastening, clasp" (12c., Modern French tasseau), from Vulgar Latin *tassellus, said to be from Latin taxillus "small die or cube," a diminutive of talus "knucklebone (used as a die in gaming), ankle" (see talus (n.1)). But OED finds this doubtful and calls attention to the variant form tossel and suggests association with toss (v.). Meaning "hanging bunch of small cords" is first recorded late 14c.