After the Spanish flu came The Roaring 20s â what fashion trend will follow COVID-19? From yoga pants to high fashion, we take a look at how COVID-19 could change what we wear. Jonathan Walford from the Fashion History Museum in Hespeler takes a look at how clothing trends shifted after the Spanish Flu in 1918 and evaluates if something similar could happen now. Social Sharing CBC News · Posted: Jan 16, 2021 1:05 PM ET | Last Updated: January 16 A fashionable woman posing with a cigarette holder. The First World War and the Spanish Flu spurred what we now know as the Roaring 20s â a time of fashion and frivolity after a decade of difficulty. (General Photographic Agency/Getty Images)