If she had asked him THAT, none of us would be here. There is no such thing as a right answer to that question.
Oh, there's a right answer, but one of the Tablets says "Thou Shalt Not Lie", and the truth is, more often than not, it ain't the fig leaf's fault. So, instead of lying, we change the subject or feign deafness. Now if God doesn't mind a little white lie, the "correct" answer is: "My dearest, a mere fig leaf could not ever hope to do justice to your beauty." (KDIBS)
Sure there is! "Does this make me look fat?" "Here, have some chocolate."
"There is no such thing as a right answer to that question."
It may not be the "right" answer, but replying "Yes, and it's really HOT, you should wear it more often!" will leave her so confused she'll never ask you again.