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A blazer is a type of double breasted jacket, like that of a suit except in that it has patch pockets with no flaps and usually, metal shank buttons. In more recent times, a single breasted form, long in existence, has come into more common use. A blazer's cloth is usually of a durable nature as it is used in schools and was used for sport. As sporting dress has become more adapted to the activity, the blazer has become more restricted to clubs' social meetings.
There are several explanations of its origin; some are apparently folk etymology. Two such are that the name could derive from the traditional practice of attaching a school's, regiment's, club's, or ship's embroidered coat-of-arms to the breast of the coat - thus emblazoning the garment. Another is that the red summer jackets of the oarsmen of the Lady Margaret Boat Club, in Cambridge, look ablaze and began a tradition which today is seen in single breasted blazers at Henley Regatta.
However, much the most likely is that the name comes from that of HMS Blazer, a frigate from the days when ratings supplied their own rigs or the captain did it for them if he wanted uniform dress. Blazer's captain, when faced with an inspection of his ship by Queen Victoria, decided to rig his boats' crews in short double breasted jackets in navy blue serge, with brass Royal Navy buttons on the model of the reefer worn by the midshipmen of his day. It seems that the Queen was duly impressed by the uniform and it became the style.
Originally, it was navy blue in colour but almost every colour and combination of colours has been used, particularly by sporting organizations. This link gives an impression of the colours available for incorporation into blazers. They often form part of the uniform dress of bodies, such as airlines, boys' schools, yacht or rowing clubs, and private security organizations.
Where the blazer is part of the dress of a school, college, sports club or armed service veterans' association, it is normal for a badge to be sewn to the breast pocket. In schools this is likely to vary according to the student's standing in the school; whether a member of the junior or senior school, being a prefect or having been awarded colours. Colours are awarded in recognition of particular achievement in some academic or sporting field. The notion of awarding colours in school is related to that of awarding colours to a regiment.