A loose outer garment or coat, particularly a short sleeveless or loose-sleeved jacket worn over other clothing.
From French casaque, which came from Italian casacca or Spanish casaca, possibly derived from Turkish or Persian origins through Medieval trade and cultural exchange.
The casaque is a fashion time-traveler—it started somewhere in Eastern trade routes (possibly Turkish), got borrowed by Italians, then French, and ended up in English with each language keeping its own spelling, which is how clothes moved as fast as ideas along Silk Road networks.
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