I never attended a semi formal dinner party and I don't know what jewelries will I match to my black sleeveless dress. Length is below the knee. Can I also wear an open toe heel shoes? Its winter.

Hello I also have recently worn a slevless black dress that's above the knee:) OK tip- if its strapless NEVER were a necklace, the naked neck and shoulders complements your body and elongates the shape, try a big pair of earings, hope this helped.