Popsugar Celebrity The Royals Prince William and Kate Middleton Halloween Costumes 10 Ways You and Your Partner Can Be Prince William and Kate Middleton For Halloween 11 August 2018 by Kelsie Gibson View On One Page Photo 10 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Royal Wedding Kate and William What to wear for Kate: a white lace wedding gown, a veil, and a tiara. What to wear for William: black trousers, a red uniform jacket, and a blue sash. Previous Next Start Slideshow The RoyalsHalloween Costumes 2018Couples CostumesPop Culture Halloween CostumesThe British RoyalsHalloweenPrince WilliamKate Middleton