"a small bowler hat and a herringbone-pattern shooting jacket"
Bowler hat and Herringbone jacket
Permission Granted by Copyright Owner for Use on Book DrumBowler hat and Herringbone jacket - Credit: Kerri

Herringbone describes a distinctive V-shaped weave, named for the skeleton of a herring fish.  Herringbone-patterned fabric is usually wool, and is one of the most popular cloths used for suits and outerwear.  Tweed cloth is often woven with a herringbone pattern.

There are many varieties of shooting jackets.  An example is the Norfolk jacket, a loose, belted, single-breasted jacket, made fashionable from the 1860s in the sporting circle of the Prince of Wales, later Edward VII. 

Herringbone shooting jacket
Public DomainHerringbone shooting jacket

The bowler hat is a hard felt hat, designed in 1849 for British soldier and politician Edward Coke, by London hatmakers Thomas and William Bowler.  Coke desired a close-fitting, low-crowned hat to protect his gamekeepers’ heads from low-hanging branches while on horseback (top hats proved terribly impractical).  The bowler hat was popular with the working class during the Victorian era, and later became part of the official work uniform of bankers.  It was later adopted by the officers of the Queen's Guards.