Suit
Sleeves

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.

Although the sleeve buttons usually cannot be undone, the stitching is such that it appears they could. Functional cuff buttons may be found on high-end or bespoke suits; this feature is called a surgeon's cuff and "working button holes" (U.S.). Some wearers leave these buttons undone to reveal that they can afford a bespoke suit, although it is proper to leave these buttons done up. Modern bespoke styles and high-end off-the-rack suits equipped with surgeon's cuffs have the last two buttons stitched off-centre, so that the sleeve hangs more cleanly should the buttons ever be undone. Certainty in fitting sleeve length must be achieved, as once working button holes are cut, the sleeve length essentially cannot be altered further.

A cuffed sleeve has an extra length of fabric folded back over the arm, or just some piping or stitching above the buttons to allude to the edge of a cuff. This was popular in the Edwardian era, as a feature of formalwear such as frock coats carried over to informalwear, but is now rare.
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