Fortunately, I've never had any woman ever ask me that similar question before. No, not even my DW of almost 25 years. I say fortunately because, for that one and another one, I have two pat answers/remarks that I just couldn't possibly be expected to filter even on my best day ever...
Her: "Do these pants make my butt look big?"
Me: "No. The size of you butt makes your butt look big."
And, if a woman talking to me with her...well...bazooooms diplayed for all to see catches me glancin' at 'em and says... "Hey! My eyes are up here." There is NO POSSIBLE WAY I could EVER resist sayin' back to her... "I know, but those are down there."
I'd then be dead after that, but it would have been worth it...!