If you need to ask the question then don't put yourself in that situation! It's easy! It's basic logic. How stoopid do you need to be? Duh! By the very fact you are asking the question.......shows you are stupid or needy or wanting to explore some personal thrill.
"I am going to my parents 50th wedding Anniversary. Should I go dressed?"
Der......gosh tricky one.
"I am going to the doctor, should I make a total arse of myself and wear frilly maid's panties?"
Ohhhh, let me think now.....
"I have been invited to a wedding and was wondering..."
Where's my shotgun?