A hand warmer made from the fur of an ermine (stoat), a luxurious accessory associated with wealth and royalty.
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Head Game
Season 4 · Episode 5 · S04E05
“Midway through the opera her ermine muff began to tremble.”
From the same episode and category.
“They've never held one in Aspen before!”
“I distinctly recall that when you asked me to go out with Maris's sister, you said that you would owe me one forever...…”
“Alas it did not belong to little Hervé!”
“Fortunately my shriek coincided with the on-stage murder of Gondolfo!”