There are several threads on the Dope about the problem of the inside of thighs chafing in summer. Men have the problem as well, but they have hairs, and Gold Bond powder, (used by cyclists).
Women have… well, they can wear hose, but those are too hot and they itch and annoy.
I used to buy nylon underskirts and just sew legs in them. That helps a lot. Or I wear cotton leggings under dresses.
There’s a third option now: Chub Rub shorts. A product I saw, and I thought: Finally, someone gets it!