BANGKOK—Blessed with flawless skin and a flashing smile, Thai college student Treechada Petcharat beat 23 challengers to win the world’s first international transvestite beauty pageant, organizers said Sunday.

The 19-year-old cross-dresser, looking for all the world like the woman her birth certificate refutes, was crowned Miss International Queen Sunday beating transvestites and transsexuals from 10 Asian countries, France and Germany.