I'll be flying first class from Kansas City to Orlando this fall. This'll be my first time experiencing this, as I typically fly coach. This time around I found a good deal on FC seats and just wanted to experience it at least once. 

Any suggestions on typical dress for first class? I know this sounds silly, but I didn't know if it's considered proper etiquette to dress more professionally or at least nicer when sitting up front?  


UPDATE: the plane(s) I’m flying on are B737-800s. I have one short layover in ATL both ways