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Longman Dictionary of Contemporary English
dress shirt
noun
EXAMPLES FROM CORPUS
▪ Every day Mones came to class in a short-sleeved dress shirt and shiny black tie-up shoes.
▪ For one thing, I forgot to turn off the iron and nearly burnt the Professor's dress shirt I was ironing.
▪ He threw my dress shirt over it so all was pale blue.
▪ He wears a suit and a dress shirt without a tie, along with a straw hat that is out of style.
▪ He wore a short-sleeved dress shirt with the collar open and his necktie at half-mast.
▪ Zach put it on and when the jacket was done up it looked as if he was wearing a proper dress shirt.
WordNet
dress shirt

n. a man's white shirt (with a starch front) for evening wear (usually with a tuxedo) [syn: evening shirt]

Wikipedia
Dress shirt

A dress shirt, button shirt, button-front, button-front shirt, or button-up shirt is a garment with a collar and a full-length opening at the front, which is fastened using buttons or shirt studs. A button-down or button-down shirt is a dress shirt which has a button-down collar – a collar having the ends fastened to the shirt with buttons.

Dress shirts are normally made from woven cloth, and are often accompanied by a jacket, collar sleeve, and tie, for example with a suit or formalwear, but shirts are also worn more casually.

In British English, "dress shirt" ("formal shirts," or "tuxedo shirts" in American English) means specifically the more formal evening garment worn with black- or white-tie. Some of these formal shirts have stiff fronts and detachable collars attached with collar studs.

Traditionally dress shirts were worn by men and boys, whereas women and girls often wore blouses or, sometimes, known as chemises. However, in the mid-1800s, they also became an item of women's clothing and are worn by both sexes today.