Take a shot a making a replica uniform. This is a basic sketch and instructions for making the very first 1912 navy blue uniform and the Khaki one introduced in 1914.
Girls could learn to ( as a group)
measure and make their own pattern pieces on brown/butcher wrapping paper
Cut, piece and pin the pattern together
Hem and add the snaps, hooks and eye, button holes and even embrieder the GS collar tabs
Note: Uniform were made to last several years blousy and big waist were made lager than needed and snaps and hooks and eyes were adjusted as a girl grew or the uniform was handed up or down to another girls.