This is what Wiki says about “maids”:
A maidservant or in current usage maid is a female employed in domestic service. Maids perform typical domestic chores such as cooking, ironing, washing, cleaning the house, grocery shopping, walking the family dog, and taking care of children.
Many maids are required by their employers to wear a uniform.
A bit more about the uniform:
French maid refers to a strongly modified style of servant’s dress that evolved from typical maids’ black and white afternoon uniforms of the nineteenth century (and their later use by stereotypical characters in risqué burlesque dramas of the bedroom farce variety). The designs of the French maid dress can range widely from a conservative look to very revealing. It is now often associated with cosplay, sexual roleplaying, and fetishism. Depending on design details, some forms can be classified as lingerie.
12 drawings below.