Not so much what to wear as what not to wear, flying vintage or aeros I will normally wear a flying suit, with or without leather jacket depending on wx and closed or open cockpit - though best is open cockpit in hot wx with non radio field when you can fly in just trousers and t-shirt. Other than this it is a case of ensuring that you do not have nylon or similar man made fabric on that will be a problem in a fire. As far as ties go to make you look pro - most professional pilots wear the tie
until they get in the cockpit (flight deck), then they take it off.
