Warren wasn't wingless at this point, as he didn't lose his wings until years later, when X-factor, the one with Jean, was formed.
Also he never had a problem folding his wings underneath a snappy suit, he had a harness he wore.
It's the fact that he would bother hiding his wings at an X-Men wedding which made me think it might not be Warren. That and the fact that Doug, Piotr and the Beast are AFAIK, the only X-Men who could talk in Russian, Doug and Piotr fluently, Hank... not so much, but he gets by.