"beside her stood a tall man, in a macintosh and a Homburg"
Public DomainHomburg - Credit: Bernard B. Demonvel (?)

A homburg is a hat usually made of felt or wool. Its defining features include the single dent through the centre of the crown and the firm fixed upward curl of the brim. Although similar to the trilby and fedora, it is less malleable than these.

The homburg was made fashionable by Edward VII, who took a liking to the hat after a visit to Homburg in Hesse, Germany, and brought the style back to Britain. Most commonly found in black, grey or brown, the homburg can be obtained in various other colours. 

It was also known as the 'Anthony Eden' during the 1930s, after the Government Minister and later Prime Minister.