Someone at my school did a study on this for psych. 80% of the guys polled preferred the look of suggestively clothed women over naked women. 70% fully clothed over naked. The most common reason selected is because they like the mystery and the 'room for imagination' where as with bare naked your left the 'bare essentials'. While nudity is still really attractice, having a little mysterious allure is always a good thing
(yes, i was part of the study, not as an subject but an assistant for the data entry. Also, something interesting was that d - f was the preferred breast size for one night stands but over 80 (83% if i remember correctly) preferred a b - c for someone that they would have a long lasting relationship. It was a damn interesting study.