When I was consulting on Wall Street, a suit and tie was "professional attire" - and I am glad to be doing what I love - helping people to buy their dream condo at the beach.
No matter what, you should what something comfortable, a REALTOR with heat stroke can't be of service to their clientele.
Just my humble opinion,
In other words, be flexible and go with what's appropriate.
I'm not dressing formal if I'm showing Vacant Land.
I'm not jeaning it if I'm going for a $5mm oceanfront property listing.
There is a lot of flex here in SE Florida, but I prefer to be rather over- than underdressed. If not for a construction site or possibly vacant lots (and then what type: on Star Island or in West Kendall for a 250 home development?), I don't like wearing jeans at showings and do not care for colleagues wearing them either. On the other hand, in our climate I wear ties practically only at closings. It's your personality, and your choice.
All the best,
Tobias Kaiser, MS, CIPS
Greater Fort Lauderdale Real Estate Broker + Consultant
Certified International Property Specialist
Director, Realtors Commercial Alliance of Greater Fort Lauderdale