What part of Florida? It can get pretty cold in Florida, also...maybe not as cold as in other parts of the U.S., but there are some pretty cold nights and cool days. Unless he's down around Miami or the Keys, he may still see some cool weather every once in a while. Florida has lost their citrus crop many times because of ice/frost during the night. So...he may not be able to wear a heavy wool scarf or hat very much, but when he needs it, it would be very much appreciated, I'm sure. I say make him something warm just in case. No matter what....your thoughtfulness would be appreciated.