Hello,
I'm new. I hafto admit to cheating, I did not read All the notes in this thread.
But, since I'm old to RSD, I may have some things to add.

I notice lots of folks talking about lose clothing, and that's true. We can't be "bound".
But, I have that thing where I can't stand a cool breeze on my "torso".
For those of us with PERSPIRATION PROBLEMS>
For that I started (in the mid 80's) Patagonia t shirts.
Patagonia calls their product "Capeline". It's Priceless if you have RSD!

They make silk weight to heavy weight. They're polypropelene(sp), made from recycled soda bottles. I found that Cotton is the WORST! It gets damp, and creates a cycle of sweat, chill, sweat, chill.....terrible
No COTTON on my back! Hardly EVER!
Nowadays they're more widely available. In the summer, I don't mind heat, but have difficulty with Humidity. In the winter, I can't stand the cool breeze, like I said, on my back mostly.
So, these garments fit closely, and don't allow any airflow close to the skin. Then, I can LAYER on top!
They make undershorts, and long underpants, socks too, and ALL can be layered.
Patagonia garments are not inexpensive, but they last forever. (Almost).

I am a comfort specialist by profession, and I note that HUMIDITY and BAROMETRIC changes have MORE to do with RSD Dis/Comfort than straight Temperature!
I've studied it, and spoken to others, who aren't as specialized in Humidification / De-Humidification, and well, we can't do much about the Barometer!
I myself, installed in my own home, central air that is slightly UNDER sized, so that it works to DEHUMIDIFY in the summer, more than just Blow cold! No vents exhaust onto where I would sit, or especially, sleep. My heat is by Hydronic Baseboard, computer controlled to respond to outside temperature. (not difficult to do).

Persperation.
I get it on my hands, feet and around my neck and behind my ears, my scalp, and on my back.
I spray my feet with anti perspirant and also my neck, after a shower.
My hands, I use Eucerin constantly. It's a lifesaver! (Just pay for it, it's WORTH it!)

It seems that "closing my pores" after a bath or shower, (Love a whirlpool) is an event. I wear a heavy cotton terry robe, full length, and have a cup of tea, or something ice cold, whatever I need.

I wear New Balance or Merrill trail sneakers. I need support that's comfy.
(I've been seen wearing them with a suit).

I'll be back, with more lifesavers, and my apologies if I've repeated what someone else has said....

Nice to be here.

ASB
Pete