I don't really get the whole ''french maid'' thing. I mean I bought one (not a fetish one, a real classy maid outfit) for kicks while cleaning the appartment and I have to say that besides being convenient, real ones aren't really fetish-worthy. They ARE very functionnal and quite girly-looking, but most victorian clothes would have the same ''cuteness'' factor to them.
I think it stems more from the S&M aspect of having a completely obedient slave, but wouldn't a Cinderella potato-sack dress be more appropriate? I mean french maids are part of a respectable union of workers and their uniforms were a symbol of trained, qualified professionnal high-grade staff which are likely more expensive than my entire living expenses. I just don't get how these two subjects got assigned together.

It's probably a little too much sexual frustration on the part of some perverted rich author who took it out in his writings.
As for wether or not it's Transvestic Fetishism, TG, CD or S&M that's making you wear it, I'd say try doing each separately. If wearing a simple dress just ''feels right'' you might be a TS or CD, if it ''turns you on'' you might just have a transvestic fetish (which is in fact quite more common than people think) and if it just doesn't do anything unless you're coherced into wearing it it might just be that you like to be humiliated for your feminine tendencies.
But, in the end, who needs all the lingo? Just go ahead and let loose doing whatever makes you feel all fuzzy inside.
''We are strong, yet we don't belong. Born in this world as it all falls apart.''