In 1943 the Cardinals kept the same uniforms, but their sleeve patch was now a shield that featured stars and stripes. This patch was worn recognizing America’s involvement in World War II.
While not shown in the uniform models below, a newspaper account describes the Cardinals wearing red undershirts in the 1943 World Series instead of the typical white undershirts.
The 1944 uniforms remained the same from 1943. When they clinched the Pennant in 1944, they switched their jerseys to button down shirts. The uniform didn’t change any elements other than swapping the zipper for buttons. We believe the team received their new uniforms about a week or two before the end of the season when they clinched the Pennant. We also base this claim on a photo of Musial at the end of the season, where he is seen with a button down shirt.
In 1945, the Cardinals continued to wear their button down jerseys.
The Journal Times: September 30, 1943
CARDINALS TO WEAR BRIGHT NEW SUITS
The St. Louis Cardinals will make their debut at the opening game of the World Series with their best red-trimmed uniforms, including new red undershirts. The streamlined shirts are the latest acquisition of trainer Harrison (Doc) Weaver, who has had sleeves of all the shirts dyed holly-berry red to match the Redbirds uniforms. Weaver, the morale man behind the world champions and always an advocate of long underwear, explained the sweatshirts are made of two layers of cloth, cotton insides and wool outside.
Cardinals Red – PMS 200
Vintage Yellow – PMS 1225
Navy Blue – PMS 288