2014-017 - like a cheap suit
Suit jackets in all styles typically have three or four buttons on each cuff, which are often purely decorative (the sleeve is usually sewn closed and cannot be unbuttoned to open). Five buttons are unusual and are a modern fashion innovation. The number of buttons is primarily a function of the formality of the suit; a very casual summer sports jacket might traditionally (1930s) have had only one button, while tweed suits typically have three and city suits four. In the 1970s, two buttons were seen on some city suits.Today, four buttons are common on most business suits and even casual suits.