The earliest documented usage of the term "blazer" was to describe the red summer jackets of the oarsmen of the Lady Margaret Boat Club in Cambridge. They were said to look ablaze and began a tradition which today is seen in single-breasted blazers at Henley Regatta. The most common colour for a double-breasted blazer is navy blue. Single-breasted styles come in a variety of colours, textures and fabrics including leather. Classification: Business Casual, Casual.