If this was the traditional uniform worn by "the help," we suspect a lot more people would be importing house staff from Paris.
We assume Rose Byrne didn't realize she looks like she should be serving macaroons to the lady of the house in this Thakoon frock. Or sexily feather dusting something.
Between the short length, black top and apron-style bottom, the similarities to a French maid costume are pretty uncanny.
Yes, the sequins make Rose look a little less like she's dressed for a super fancy Halloween party, but she's still a little white hat away from being asked for another glass of wine.