I actually like her design. I never really noticed the maid outfit myself... although one could argue it's a typical medic/nurse like outfit too.
It's the apron in the front, but she looks more like a medic/nurse type.
Like Jello says, it's the apron.
I like her design too, so much my avatar married her. (End-game credit spoiler, maybe.)
The way her skirt is never really kept in place over the wire thing goes well with her attitude. Her kid is hysterical.