Men's Fashion: Mid 1920s 'Jazz Suits' were trendy because after WWI, people started to live a different lifestyle that led away from the formal three piece suit with shoulder pads. Life became edgier, more party-like and men dressed in simpler clothing, with hats, and fashionable canes to go out dancing and partying.
"A man of fashion in 1700: A fashionable man in 1800", drawn, etched & published by Dighton, Charg. Cross, London, 1800. Copyright Lewis Walpole Library, Yale University. For more info: http://twonerdyhistorygirls.blogspot.com/2012/03/more-fashions-for-gentleman-1700-vs.html
Equestrian Fashion Worn by Seriziat in the Regency Era......As the Regency Era began to take hold in society from around 1795 to 1825 men's fashions followed suit. Men's clothing styles began to take on a new look with designs inspired by the French Revolution. Men also began to favor clothing from the equestrian way of life made popular by the English country gentlemen. Icons of fashion at the time were men like Beau Brummel