housecoat
US /ˈhaʊs.koʊt/
UK /ˈhaʊs.koʊt/

1.
a woman's loose, lightweight robe for informal wear around the house.
:
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She slipped into her comfortable housecoat after a long day.
•
My grandmother always wore a floral housecoat in the mornings.
a woman's loose, lightweight robe for informal wear around the house.