pinafore

US /ˈpɪn.ə.fɔːr/
UK /ˈpɪn.ə.fɔːr/
"pinafore" picture
1.

a collarless, sleeveless dress worn as a pinafore or jumper, often over a blouse or sweater

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She wore a blue pinafore over a white shirt.
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The school uniform included a grey pinafore.
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jumper dressapron dresssmock dress
2.

an apron, especially one with a bib, worn by a child or over a dress to protect it

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The toddler wore a cute floral pinafore while eating.
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She tied a clean pinafore around her daughter to protect her dress.
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apronbib