"What about the hair, Susan?"
"Long hair is fine."
My apologies to any maids who do dress like that. I'm not 100% sure what color that dress is, but this is Grace, so...
Actually, that doesn't really narrow it down much. She likes green, yes, but she doesn't HAVE to wear green! It could be red! Or blue! Or purple! Or plaid! Yes, I said plaid! You don't know! Maybe there isn't much contrast between the colors used in the pattern when in greyscale!
But yeah, it's probably green. Maybe.