Which dress for beauty pageant

Hi everybody.I have a odd kind of query to you people.It may seem funny to someone but I'm serious.I'm mom.I have a son who is 26 years old.My fashion query is related to my son.My son is a female impersonator.This time he has got a chance in a Beauty pageant in Thailand.He does not have any style expert,for him I am his style expert.So I need to know that which styles of gowns are suitable for a Beauty pageant?Which colors are preferable?My son has a very fair complexion.He is slim and tall (171cm).His figure is bust 36 inch , waist 28 inch , hip 39 inch.Also what types of swimwear are suitable for swimwear round?A 2 piece one?He will also wear a lehenga and a Saree in a round representing his country.So which styles will be suitable?

 

I need your help ladies and girls.Please suggest.