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There are various different styles of collar, which is the primary indicator of the formality of a shirt. These are all attached collars, not styles specific to detachable collars.
Spread collars measure from around 3½ to 6 inches between the collar points, and the wider collars are often referred to as cutaway or Windsor collars after the Duke of Windsor. This city style is more formal, though it is common in Europe, and predominant in the UK.
Point, straight, or small collars are narrow, with 2½ to 3¼ inches between the points of the collar.
Button-down collars have points fastened down by buttons on the front of the shirt. Introduced by Brooks Brothers in 1896, they were patterned after the shirts of polo players and were used exclusively on sports shirts until the 1950s in America. It is still considered a more sporting style, and, particularly outside America, traditionally dressed men still do not wear suits with this style of collar.