Contact the WWI Museum in Kansas City. It’s not a military uniform but it could be an auxiliary of some sort or a girls group to support the war effort. They have rearchers and volunteers who are experts and great archives. It’s the only museum dedicated to WWI in the country. They just did a major overhaul and expansion. If you’re in the area its really worth visiting. But you could probably email the picture and question. Go to their website.
Thank you for your idea. :~)