This illustration from 1856 is of a royal visit to a Lithograph factory. From the Times: "On Tuesday week, their Royal Highnesses the Prince of Wales and Prince Alfred, accompanied by Mr Gibbs, Dr Becker and Colonel Biddulph, honoured the establishment of Messrs Day & Son, lithographers to the Queen, with a visit, in order to inspect the progress of the many important works on chromo-lithography now being produced in this eminent firm."

A look at daywear suits, where a doctor and a colonel wear the same shape of dark coat for a visit, with the highest hats... also we get to see a boy's hat and a work apron.