See the link below for current regulations.
Also see "The Horse Soldier, 1776-1943: The United States Cavalryman, His Uniforms, Arms, Accoutrements and Equipments", by Randy Steffen (University of Oklahoma, Norman, 1979). Vol. I has a color section which shows the Army Blue Uniform. Vol. IV, pp. 77-93 details the 1938 origin of the current uniform.
This work was sponsored by the Company of Military Historians as a standard reference work.
James B. Ronan II
To Join the Company of Military Historians click here