I think that there is an important difference between suits and dresses. Suits are purely formal attire whereas dresses are formal, but are also designed to present the wearer as sexy. I don't think that there is any mens attire that is analogous to a dress. Anything that a man can wear that is revealing or sexually suggestive is really casual (eg. shorts and no shirt on a beach) or really cheesy/sleazy (eg. deep v-cut t-shirt and super tight pants).