During my first 15 or so years with RSD, I was the same, as you all say, very susceptible to the cold.
I use to this day, lots of 'Patagonia' underthings, especially shirts, they make t shirts, zip t shirts, long or short sleeve, and of different weights silk weight, to heavyweight.
It's called 'Capaline'.
Don't not get a couple for yourself! I have nothing to do with the company, nor do I even own stock.
But, go to
www.patagonia.com
and search
Capeline. (Sp)
Sorry, someone will pop in to help you in about ten minutes.
I swear by this stuff, it's made of recycled plastic soda bottles and it WIll NOT get Wet!
It quickly wicks all perspiration away, and you don't get that 'Second effect Chill'!
Which is nasty.

Anyway, I had a 2nd accident, which (as you might tell) caused a head injury.
Now,
of all things, I can't stand Heat and Humidity! Figure that one!?

I'd rather dress well, (with patagonia stuff), than hafto sweat in the heat!
I like cool, LOW HUMIDITY. By cool, I mean 60 - 70 degree weather.
I cannot take or stand, 80+ with humidity.

And, we cannot forget the Barometer! When it's falling, or low, it hurts. When it's going up, or is high, better, much better!

Problem is, I've no idea, if this (the temperature thing) is due to the second accident, or if it's just because my rsd is so far advanced. 28+ years.

We Persist, and Carry On!

Be well all!

p
asb