Freedom of expression has NEVER been interpreted to allow public nudity. The principle is the same.
Actually, if you review the career of Spencer Tunick you'll see that public nudity is in fact very much a legally protected act of self expression that is legal in many, many places and gets "judicially legalized" when it is challenged in an increasing number of jurisdictions.
How one chooses to dress is an act of self-expression. Revealing skin is a protected act. We may not like it but it's protected.