A small gown or a child's dress; a diminutive or decorative gown.
From 'gown' plus the diminutive suffix '-let,' which comes from Old French and creates nouns meaning a small version of something.
The suffix '-let' is why we have 'gownlet,' 'booklet,' and 'droplet'—it's a productive way English builds tiny-sounding versions of words, making them sound cute or less serious.
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