By 1920, the wardrobe for the female members of the Choir begins to have more unity. In this picture, all the women appear to be wearing white, though a careful inspection reveals they are likely not all wearing the same cut and style of dress. This is all but confirmed by reviewing their 1930s wardrobe (see below).
Photo from Deseret News.
Here, the women of the Choir more clearly are wearing different dresses, though all fit into the same value range (light colors). Especially fun in this photo are the flapper-style dresses that can be seen on the four women standing on the right in the photography.
Photo from mormontabernaclechoir.org
In the 1940s, the Choir's dress was finally and completely standarized, no doubt in response to the expansion of television broadcasts and the Choir appearing on screen for the first time. This skirt is one of those worn for the Choir's first TV broadcast in the 1940s, and is notable for its shorter length.