Suit on the plane if potential employer is picking you up?

I was recently asked back for a second interview for a potential employer and have to get flown from the midwest to the east coast, where the employer will then pick me up. I'm aware of proper attire when going to the interview, but should I have interview-level clothes on when they pick me up? Business casual? Just don't look like a slob? They didn't really give me much to go off of..

Any helps appreciated. Thanks guys!

Suit on the plane if potential employer is picking you up?