It’s suggestive, like wearing pants under a skirt or underwear on top of clothing.
How is wearing pants under a skirt suggestive?
It is amazing the kinds of garbage you women come up with to make crazy tznius rules.
You lose credibility by saying this stuff. Maybe that is why your daughters are wearing skirts that don’ cover their knees.
(And as far as it being like wearing underwear over your clothes, that is stupid.)