Someone who designs clothing professionally.(noun)
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Use "fashion designer" in a sentence
"I had no idea where any of these fads came from, even po-mo pink, which some fashion designer had come up with."
"But the fashion designer couldn't make people buy po-mo pink, couldn't make them wear it and make jokes about it and write editorials on the subject of "What is fashion coming to?""
"The midtown garment shop where she worked was owned by a Chinese contractor for DKNY, fashion designer Donna Karan’s high-end clothing label."