From the First World War until the early 1950s, Officers and Chief Petty Officers wore blue service dress caps. Detachable covers were provided, white for tropical and summer wear, and tan for wear in bad weather. From the 1950s until Unification, caps were provided with the upper body made of white plastic. Officer's caps were similar to those worn by Petty Officers, but were of superior quality. Officers with the rank of Captain had a single row of gold embroidered leaves on the brim, Flag Officers (Admirals) had two rows of leaves.
Ratings wore the typical flat hat with the HMCS cap tally. Removable khaki or white covers were provided, and worn according to local dress instructions. Sennet hats were introduced into Royal Navy Service in the late 1800's and were worn by the Canadian Navy until the mid 1920's. They provided a great deal more protection from the elements than the flat cap and were very popular. Sennet hats were also worn by Officers, especially on Naval landing parties.