every human culture dresses--all cover genitals, many others dress for ornimentation. (in some tropical countries, tatoo's sub for ornimentation)

clothing has some function (like picking blackberries!) but more often then not it is a social status reference.. (the cloths do make the man or woman.. be it jeans, or formal wear, or uniforms.. (everything from a mc donalds worker to the police officer))

you'd think then that nudist colonies/parks would be more socially 'flat' but.. they are self selected group, and status is still defined (just not with clothes)