Interesting clothing the girls are wearing. I assume that they are wearing uniforms of their organization. What I find interesting is the girl in the front seat and the girls on the tail gate are wearing some sort of leggin's. Again assuming the 1920's era, this would be a bit unusual for young ladies or women to wear "short skirts and pants".
Pictures of my mother and her sisters of that era always had girls dressed in ankle length dresses.
When I was in grade school I remember a girl came wearing leggin's under her dress and the principle sent her home, telling her girls had to wear dresses and leggin's were not acceptable. This was in the early 50's.
It was common up to the 60s for scouts to wear surplus military uniforms, the Sea Scouts wore Navy uniforms and the Boy Scouts worn Army uniforms. I think it would be a good thing to go back to that tradition, the BSA manages to soak the boys with the cost of uniforms these days, and as a tax free business, they are able to keep all the profits. I can not believe that a collarless, short sleeve shirt (made in china) for a Cub Scout should cost twice what a good Wrangler shirt costs at a retail store.