The term 'fashionable, formerly' can be summarized by the crossword solution MOD, which is an acronym for 'Modernism of the 1960s'. This term refers to a style of dress and culture that emerged in the 1960s, characterized by bright colors, geometric shapes, and a focus on youth culture. It was a reaction to the more conservative styles of the 1950s, and has since become a popular fashion trend.