I can't imagine our maid wearing a uniform. I believe I haven't seen to many private employed maids wearing uniform but perhaps I don't circulate in elite circles enough.
maybe you did not notice. uniformed maids i see normally wear scrubs, or whatever the word is. like this:
http://www.idbylandau.com/maid-uniform-p/tia_8382.htm
often in bright colours or with cheerful pattern like little ducks, flowers and so on (if she takes care of the kids). basically
something a nurse or kindergarten carer would wear.