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A Henley shirt is a collarless pullover shirt, characterized by a 10-centimetre-long (4 in) placket beneath the round neckline, usually having 2–5 buttons. It essentially resembles a collarless polo shirt. The sleeves may be either short or long, and it can be made in almost any fabric, although cotton, cotton-polyester blends, and thermals are by far the most popular. Henley shirts are generally regarded as menswear, but women's versions have appeared as business casual and casual wear as well.
Originally quite popular in the early 1970s, Henley shirts have recently made a fashion comeback, especially in Western countries such as the United Kingdom, United States, Canada, and Australia, but also in some East Asian countries such as Japan and Korea.
In his biography of Ralph Lauren, the journalist Michael Gross quotes a New York merchant who recalled showing a vintage shirt to a Ralph Lauren buyer: "I showed this fellow underwear—a three-button long-sleeve shirt by Johnstown Knitting Mills. He said, 'This is a new shirt.' That's where he got the idea for the Henley shirt."
- Centeno, Antonio. "Henley Shirt – Classic Alternative To The T-Shirt – Stylish Casual Shirts For Men". RMRS -- Real Men Real Style. Realmenrealstyle.com. Retrieved 31 May 2015.
- Gross, Michael (2003). Genuine Authentic: The Real Life of Ralph Lauren. New York: HarperCollins Publishers. p. 22. ISBN 9780060199043. OCLC 50520401. Retrieved 2 October 2013.