I understand that keeping the shoulders/back of the neck areas warm can help with the upper body, layering is important. WOOL not man-made fibres. Liberty bodice anyone?
.
Keeping a good layer of warm clothing around the hips might be wise to encourage warm blood into the lower limbs. My feet feel cold all the while but Himself says they feel OK to him.
https://www.sruk.co.uk/raynauds"Keep warm - Do all you can to avoid cold environments, touching cold items or spending time in areas where temperatures fluctuate. Even a slight change in temperature can cause an attack.
"Wear lots of thin layers and loose clothing in order to remain as warm as possible.
"Use hand warmers, gloves and thick socks to keep cold fingers and toes comfortable on chilly days.
"There are some more products to help keep warm in our online shop such as thermal shoe insoles and fleece blanket.
"Relax and pace yourself - Try to steer clear of stressful situations as stress and anxiety can trigger an attack. Take rests when you can to avoid getting too fatigued".