I absolute don't think about strick nun on original style in maid outfit..

Clumsy has her fun and the Ducks like to dress like maids as well but I don't think Star will like that form of Debt forgiveness. Or any cookie debt at all.

Also from where does this maid dress come from?

Well, originally, Nuns' habits would have evolved from the garb of the poorest women rather than striving for magnificence like a bishop.