The first stewardess uniforms were designed to be durable, practical, and inspire confidence in passengers. The first stewardesses for United Airlines wore green berets, green capes and nurse’s shoes. Other airlines, such as Eastern Air Lines, actually dressed stewardesses in nurses’ uniforms. Perhaps reflecting the military aviation background of many commercial aviation pioneers, many early uniforms had a strongly military appearance; hats, jackets, and skirts showed simple straight lines and military details like epaulettes and brass buttons. Many uniforms had a summer and winter version, differentiated by colours and fabrics appropriate to the season: navy blue for winter, for example, khaki for summer. But as the role of women in the air grew, and airline companies began to realise the publicity value of their stewardesses, more feminine lines and colours began to appear in the late 1930s and early 1940s. Some airlines began to commission designs from high-end department stores and still others called in noted designers or even milliners to create distinctive and attractive apparel.