What do you call a sleeveless garment resembling an apron, typically worn by young girls?

The term that best fits the description of a sleeveless garment resembling an apron, typically worn by young girls, is a pinafore. Pinafores are designed to be worn over other clothing, often featuring a bib at the front and straps that go over the shoulders. They provide a practical and cute option for young girls, making them a popular choice in children's fashion, especially in settings where protective clothing is beneficial, such as during meals or crafts.

In contrast, a smock is usually a loose-fitting garment worn primarily for protection while working or engaging in messy activities. While it can be sleeveless and provide some similarities to a pinafore, it is not specifically designed for children nor primarily resembles an apron in style. Overalls typically refer to trousers or shorts with a bib and shoulder straps, designed for adults and older children, thus not aligning with the description provided. Tunics are generally longer shirts that can vary in design but do not have the apron-like characteristics mentioned.