So when did the hat disappear from daily gentleman's attire? There are many reasons -some economic, some social, but president John F. Kennedy was blamed for the abrupt decline in the sales of men's hats when he didn't wear one during his inauguration in 1961.
The same rule for wearing white applies to wearing hats. Felt hats are worn after Labor Day until May 30 and straw or light fabric hats are worn between the two dates for the summer.



