This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A light summer dress with a bodice that exposes the arms and shoulders.

n. a lightweight, typically sleeveless dress, usually a minidress, intended for summer wear

n. a light loose sleeveless summer dress with a wide neckline and thin shoulder straps that expose the arms and shoulders

"It's not yet 9 o'clock, and she's been cleaning up since dawn in her sundress, which is the color of shamrocks, and her big silver jewelry."

frock    dress   

camisole    negligee    pantsuit    sarong    nightgown    singlet    halter    sputum    Popsicle    miniskirt