Someone could dress as an umpire. The costume begins with the letter U.
You can dress as E.T. You can dress as Elvis Presley. You can dress as an elephant.
Animal
LanaGames
Augustus Ceasar
Unicorn, Umbrella
You can dress as King Neptune, a king, kitten or a knight.
You can dress as Tarzan or a tramp. You can dress as Tony the Tiger or the Tin Man.
Karate Kid
Widow
leggings.
You could dress as an airline hostess or an angel. You could dress as Alice in Wonderland or an Arabian princess.
do you mean dress up as in fancy dress?? Cowboy, clown, cat etc