Yves Saint Laurent and his "twin sister" and YSL muse Betty Catroux from Tomboy Style

Women who dress boldly, androgynously – sometimes mixing in men's styles – will resurface and recede as an iconic and oft referenced trend, but never does it go out of style. A new book by journalist Lizzie Garrett Mettler entitled Tomboy: Beyond the Boundaries of Fashion is a "visual history that chronicles the past eighty years of women who blur the line between masculinity and femininity [and] explores the evolution of the style and its icons."