The old rule of thumb of seasonal white used to be the norm, but I think that’s realxed quite a bit in recent years. To me, it’s not what the calendar says, but more of what the weather is. There is “winter white”, which is a cream color. When we lived in Texas where it was hot much earlier than it is here in the north, we wore white much sooner. If you’re going to Florida, I’d take in consideration the temps down there now. I’d wear the sun dresses only if it was hot enough. Maybe a short jacket over them would be an option.