Wearing or dressed in a gown; clothed in a gown.
From 'gown' (from Old French 'gonne', possibly from Arabic 'gunna') plus the suffix '-ed' (forming an adjective meaning 'having' or 'wearing'). Medieval origins in European fashion.
The '-ed' suffix can mean 'dressed in' or 'having'—so 'gowned' means wearing a gown just like 'bearded' means having a beard, and it appears in literature to show elegance or formal occasion.
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