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summerweight

British  
/ ˈsʌməˌweɪt /

adjective

  1. (of clothes) suitable in weight for wear in the summer; relatively light

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Seated at Ms. Wintour’s table in the Hammerstein Ballroom, along with Nicole Kidman, Tory Burch and Huma Abedin, and wearing a Bally summerweight suit the color of rosé, was Mr. Picardi.

From New York Times