Elegant or Prom?

My mom recently came back from a wedding in Sydney and she got me a dress. On the phone she made it sound really fabulous, "it is a evening dress in a pale sea green color, that goes just below your knees with a matching shawl/scarf. Everyone, even your dad, thinks it is very elegant and gorgeous!" It never occurred to me that I'd want a pale green dress, but seeing as it IS Christmas, maybe