2nd girl from left has bobbed hair from 1920s
undergarments are camisoles like this
https://www.etsy.com/listing/201493321/1920s-girls-underwear-authentic-20s
shoes are t-strap mary janes also from 1920s
https://vintagedancer.com/1920s/history-of-1920s-fashion-shoes/
headbands also became popular in 1920s
so I think 1920s