The 1930 and 1931 uniforms seen in the photographs are very similar. The differences that jump out are the sock stripes are different, and perhaps in 1930 the star patch was a solid color, while in 1931 the star patch had two colors. The other difference could be the STL on the caps, but we have no closeup photographs to get any detailed estimations.
These uniforms and logos are best approximations based on a scarce number of photographs. Years, colors, logos, and uniform styles have been approximated. We welcome any additional photography and newspaper accounts that will help bring the authentic St. Louis Negro League baseball uniforms back to life.
Cardinals Uniforms & Logos 