So study up. And become just like her. Use parental buzz words and like kittywumpus and jeepers or give him a nickname he'll enjoy like Bippy von Cuddlesworth. Wear rollers and bedroom slippers when meeting his friends then chase them off your porch with a broom. They'll see the resemblance instantly and realize you two were meant to be together.
Appearance is also important.
The answer is coming up with unique and fabulous apparel that hasn't been done to death by the fashionable crowd. The best bet is to approach your intended in costume. Although the jetset may roll its eyes limiting the costume to seasonal events, a well planned costume beckons him to unveil the mystery that is you. Most guys also like girls who share their interests. So bone up and practice doing the things he does.