A long dress that covers the entire body from the neck to the feet, including the wrists and fingers.
Flawle55Dre55 should be enough for most condition,
if it works bad, add '(any color) dress,' before it.
if you want to create maid or nun pictures, you can use 'gloved sleeves' as addition to avoid exposed hands and white cuff.
if the gloves and body are diffrent color, add specific color to prompt, for example'blue Flawle55Dre55, blue gloved sleeves'.
and known issue: if you create a nun picture with black dress, the gloves are likely to be white.