My question would be.....do you even have to wear clothing? I’m one of the “free-as-a-bird” types and would prefer to take all tests and exams with nothing on. Surely, they could accommodate me.
Being naked is more natural than a desire to wear the clothing of the opposite sex.
We are born naked. Clothing is determined by culture (and trends) and social values.
There is no gene to “wear the clothing of the OTHER sex”.