Boys, what outfit do you find most attractive on girls?

Just curious, what clothes you find the most attractive on girls? Don't answer with "confidence" or any such reply. I'm asking about an outfit that makes you unable to take your eyes off her or keeps you thinking about her afterward.

Or is it mostly about her face? As in, if she's beautiful, she'll look good in almost anything, and if she's not, the outfit won't make much difference.