By World War I, the grey option had fallen out of favour but the "midnight blue" alternative became increasingly popular and rivalled black by the mid-1930s. Notch lapels, imported from the ordinary business suit, were a brief vogue in the 1920s. A single stripe of braid covering the outseam on each leg was an occasional variation at first but became standard by the 1930s. At this time double-breasted jackets and white jackets became popular for wear in hot weather.
By World War I the grey option had fallen out of favour but the "midnight blue" alternative became increasingly popular and rivalled black by the mid-1930s Notch lapels imported from the ordinary business suit were a brief vogue in the 1920s A single stripe of braid covering the outseam on each leg was an occasional variation at first but became standard by the 1930s At this time double-breasted jackets and white jackets became popular for wear in hot weather