The CASC came into the war wearing the 1902 pattern tunic and Service Dress Caps. The SD cap worn at the beginning war was unpopular with the troops in the trenches. It had a wire stiffner and was better suited for parades than for life at the front.
By 1915 , a "trench" cap was designed without stiffners in both the crown and peak. While it lost some of its military appearance, it was practical and comfortable for the troops.
Officer pattern service dress caps were of made of higher quality materials. As officers uniforms were private purchase, there were many different manufacturers but all had to conform to an approved pattern.
The introduction of steel helmets in 1916 relegated the soft caps to wear behind the lines. The Mk I "Brodie" helmet was the standard helmet for the Canadian Expeditionary Force.
Details of the interior of the Mk I