During the 1970s a new generation of menswear boutiques sprang up, aiming to change the decor, rituals, and customer base of a traditionally 'difficult' trade. To sell fashionable clothes to a young man at the end of the 1960s was still, in many circles, tantamount to questioning his masculinity. Men's appearance changed more in the 1970s than it had done in a whole century. Many of the fashion designers who revolutionized the male look owed a lot of their innovations to Pierre Cardin: narrow shoulders, tight-fitting lines, no tie, no interfacing, zip-up boiler suits, waisted jackets or tunics, sometimes no shirt. Work clothes supplied inspiration for a less formal style, encouraging designers to look beyond the traditional suit and, for example, adopt a unisex look or investigate the massive supply of second-hand clothes. Sometimes this kind of male dressing-down, often denounced as 'hippie', gained formal recognition as a deliberate look. At certain other times, as part of a retro movement, designers introduced a revival of 1930s elegance. The unearthing of old military clothing, preferably khaki and from the United States; English-style shoes; Oxford shirts; immaculate T-shirts; tweed jackets with padded shoulders; brightly colored V-neck sweaters; cashmere-printed scarves draped around the neck all imposed a certain uniformity on the casual beatnik look of the male wardrobe at the end of the 1970s.