Above, above right, below and below right: all by Yves Saint Laurent.
In 1966 Yves Saint Laurent introduced a sleek tailored trouser suit called Le Smoking. The formal structure of the male tuxedo contrasted with the feminine blouses created a sexy, androgynous look Although radical at the time of its introduction, it would be the garment that sealed the acceptability of trousers as an alternative to the skirt, suit or dress. This was a formal, elegant suit for women. It was a great success and became a staple in many women's wardrobes during the 1970s.
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