It reminds me of Sexiled light novel, which is focused around fighting sexism in a jrpg like fantasy setting.
In that world, female adventurers wore skimpy ineffective armor because over generations they were taught a superstitious view that more open skin equals more mana.

Naturally, at the novel's cover the protagonist wears properly covering armor, a symbol of rebellion against both sexualization and traditional (for that world) gender roles.

https://en.wikipedia.org/wiki/Sexiled