"A tish bekishe is like a long Victorian smoking jacket, worn to the Shabbat table by some Chasidic men. My husband (who does not identify as Chasidic) wanted one partly because a bekishe is machine-washable and a suit isn't: a bekishe is good if your toddler likes to pour soup in your lap." (source)

"Hasidic men typically wear a black overcoat known as a bekishe." (source)