Okay, now, I know we just recently had another situation with a French maid outfit, and that could lead certain people to make certain accusations!
Accusations that are probably correct, BUT! And however! This storyline was inspired by a very recent game called Nier: Automata (it's topical darn it!), and about a billion other things.
As far as I can tell, fighting androids in dresses not at all suited for combat is basically a genre unto itself (with more than one example having a maid theme), and Nier: Automata got me thinking about in-universe explanations for why they'd dress that way.
The obvious answer is lonely, lonely scientists, but I'm going in a slightly different direction...