None of the other words are conjunctions: <em>dress </em>is a noun, <em>are </em>is a verb and <em>of </em>is a preposition. Only <em>yet </em>can be used to coordinate elements (i.e., link elements at the same level) in a sentence. In this case, the elements are the adjectives <em>simple</em> and <em>elegant, </em>but yet can also coordinate whole clauses (e.g. I told you she was lying, yet you never believed me).
