Noun
a boy's ensemble; copied from a sailor's uniform
Source: WordNetEric Daman and Meredith Markworth-Pollack: "Vanessa is a breath of fresh air. She's the Lower East Side, Raising Victor Vargas home-girl. One night we saw M.I.A. in concert wearing a sequin sailor suit and were like "Omigod, she is so Vanessa.”" M.I.A.
As of 2012, 50% of Japanese junior high schools and 20% of senior high schools use sailor suit uniforms. Source: Internet
The Asahi Shimbun stated in 2012 that "The sailor suit is changing from adorable and cute, a look that 'appeals to the boys,' to a uniform that 'girls like to wear for themselves.' Source: Internet
Takeuchi attended Kofu Ichi High School. citation She wore sailor suit uniforms and joined the astronomy and manga clubs. citation This experience later influenced her work, Sailor Moon, as well as her previous manga such as Love Call and Rain Kiss. Source: Internet