If a lady shows up to a Trad chapel half-dressed, and she is a regular attendee, then she's wrong. She can have the best intentions in the world, but she's still immodest.
You said it was feminized logic to assume she was new and ignorant.
Personally, I would rather assume the person in front of has the fear of God and would correct their behaviour if they know it is wrong.
If they aren't new then they don't have an excuse they should know better.