In 1931 the Cardinals maintained the same uniform design from the ’30 World Series. The socks for home and road was the same as the 1930 road uniforms.
The Cardinals returned to the World Series in 1931, and wore the same uniform design from the ’31 regular season, but with new socks. The socks were white with a thick red stripe near the top. Physical samples of this jersey show a green four leaf clover was stitched into the shirt tails of the World Series jerseys.
St. Louis Globe Democrat: March 22, 1931
During the training season the players wear the uniforms of the past year, the regulars, as a rule, being clothes in one set, the rookies in the other so as to distinguish them. The home uniforms, by the way, that is those worn in a teams home city, usually are of white flannel whereas the “road” uniforms, save in rare instances, are of grayish flannel, the Cardinals using a reddish gray.
Cardinals Red – PMS 200
Vintage Yellow – PMS 1225
Navy Blue – PMS 289