Scanned from a cabinet card circa 1895
A studio portrait of men wearing aprons
During that era the colour of the apron worn indicated the trade of the wearer, in this case white would be stonemasons.
Other trades are blue with white stripes for the butcher, checkered for the barber, black for the cobbler, green for butlers and blue for weavers, spinners, and gardeners.
Photo by Rankin & Dunbar of Paisley, Scotland