If this is tomorrow you're best off with shopping your closet.

Personally, I'd dress for the conference and just wear that outfit on the plane. A flight to Florida isn't long enough to really need to take comfort dressing into account.

Tomorrow I’m flying to Florida for a conference. I’m likely going straight to conference activities and a dinner (there’s no guarantee my room will be ready), but also want to be comfortable for the flight and need to take into account the weather change. What should I wear?