Presentation IS important, outgoing friendly personality is what you need to present. They're looking for people who can interact well with other crew, customers, and employees while wearing a standard uniform. Work the crowd the entire time.

They will be a bit leery of a pilot who needs personal attire props to set the tone for their social interactions. Too often that's a master caution for "prima dona" or "tool".

You can probably get away with reasonable sideburns. Still professional, but fun when appropriate.