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In OTL, the three piece suit began to pass out of fashion as a result of the economic restrictions of the 1930s and 1940s. After World War 2 ended, it was considered proper attire to simply wear a shirt, tie, and a suit jacket. The 1960s did further damage to the pretige of the suit in general.
With a POD no later than 1932, find a way that the three piece suit is still considered the standard to this very day. Extra bonus points if you can save hats from fading away as well.
(It should be noted, that I have a strong long of waistcoats and hats, and wear them when ever I can. This is likely because I am, at heart, a nerd. But a well dressed nerd at that! )