Jackets worn by school children as part of a uniform in a lot of British schools.
Most of them are straightforward colours like black or dark blue but my own school had a particularly revolting colour scheme of red and navy blue stripes.
This wasn`t as bad as another local school though which had a sickening combination of orange and silver stripes.
Maybe it was meant to encourage a kind of tribal warfare.

Blaz"er (&?;), n.

One who spreads reports or blazes matters abroad. "Blazers of crime." Spenser.

 

© Webster 1913

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Blaz"er (?), n.

1.

Anything that blazes or glows, as with heat or flame.

2.

A light jacket, usually of wool or silk and of a bright color, for wear at tennis, cricket, or other sport.

3.

The dish used when cooking directly over the flame of a chafing-dish lamp, or the coals of a brasier.

 

© Webster 1913