1967
First Pantsuit

 A year after the tuxedo, Yves Saint Laurent proposed his first pantsuit in his Spring-Summer 1967 collection. It was an unusual design for a suit, which was traditionally worn with a skirt. Just as he did for the tuxedo, Saint Laurent adapted the traditionally masculine suit for the female body. The sleeves were fitted and the waist belted, while the wide pants were flattering for the legs. He added typically female accessories, such as heels and jewelry, but still had his model wear a necktie and felt hat.

American women are going to want to burn all the clothes they have when they see this ... Saint Laurent's new Vastsuits in men's wear fabrics are the sensation of the Paris season ... What a show—it could have come right off Broadway.

Women’s Wear Daily, January 31, 1967.