The sizes listed on this page are from the Catalog of Navy Material, Bureau of Ships Section, 1951 edition. The information presented here is from the Naval History and Heritage Command reference files, in particular the Navy Department Library and the Curator Branch, Material Section. The fly is the length that is tangential to the pole. The hoist is considered the edge of the flag that is parallel to the pole.

Ensign size number 11, manufactured at the Cavite Navy Yard, Territory of the Phillipines, in June 1940 Ensign size number 8, manufactured at Charleston Navy Yard, SC Each Navy Yard had an abbreviated code to facilitate manufacturing and quality control. Manufacturing information would be printed on the flag with the identification, manufacturer, size, and fabrication date. Each yard had a 'sail loft' that cared for textiles, and in some cases operated a factory to keep up with demand. Navy Yards manufactured many of the flags used by the Navy from the 1890s to the 1960s.

This allowed manufacturers to have consistent sizes for each situation. a warship a flag known as the Royal Standard was flown from the mast. Each size was denoted by a number, and keyed to specified dimensions. Examination of British regimental flags is to see the military history of the. Navy standardized the sizes of flags available for use.

World of warships historical flags