"The peaked cap, service cap, forage cap, barracks cover or combination cap is a form of headgear worn by the armed forces of many nations, as ...
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well as many uniformed civilian organisations such as law enforcement agencies and fire departments. It derives its name from its short visor, or peak, which was historically made of polished leather but increasingly is made of a cheaper synthetic substitute.
Other principal components are the crown, band and insignia, typically a cap badge and embroidery in proportion to rank. Piping is also often found, typically in contrast to the crown colour, which is usually white for navy, blue for air force and green for army. The band is typically a dark, contrasting colour, often black, but may be patterned or striped." - (en.wikipedia.org 28.09.2020)