As early as the 1920’s the single breasted suit has been in fashion. Certainly, it has gone through many changes over the years in terms of fit. Early on they were tight fitting, then around 1935 they became loose fitting and in the 1970’s became tight fitting again. It seems at present the trend is back to slimmer fitting, single breasted suits.
There is more than one type of style of single breasted suit, also known as the “SB “ suit. Most of the styles have to do with how many buttons and what style of lapel is designed into the jacket.