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Use "formals" in a sentence
"Traditionally, men's shirts are classified as formals and casuals."
"Since it is cotton, she can do that more easily, when a lot of "formals" still hang in the closet, made of chiffon and delicate fabrics unsuitable for daily wear."
"I would take out those teen romance novels -- stories about lovelorn young girls who wore "formals" and went to proms with boys."