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davidcyclebackThere were Bloomer Girls teams as early as the 1890s. Luckily for you, there were a limited number of teams, so you may be able to make a photo match with time.
Thinking about it, there were likely no formal women's college or high school baseball teams at the time. Presumably, these women are baseball players, as you don't have a catcher's mask for slow pitch softball (They wouldn't be playing fast pitch softball). So it's a safe bet these are Bloomers. And if there were period formal women's college or high school softball teams, they would wear much more feminine unoforms.