 The dresses had been designed to the then-new miniskirt style, popularized a year earlier by Mary Quant.In conjunction with the opening of Expo 67, the Canadian Post Office Department issued a 5¢ stamp commemorating the fair, designed by Harvey Thomas Prosser.The World Festival of Art and Entertainment at Expo 67 featured art galleries, opera, ballet and theatre companies, orchestras, jazz groups, famous Canadian pop musicians and other cultural attractions.