Replying to What are some of the best base layer brands?

yo , i get cold as fuck while i ride mainly because i have a condition where my body has to work like 10x harder than the normal person to make/maintain warmth ( Wilson's syndrone i think what it called). i got some HH base layers but the are too thin, don't know if i just got a thinner pair or what but i have to double up with those. Under Armor has treated me the best , but again i just cant keep warm and have to double up still. what would you suggest doing ? buy some new base layers , or should i spend a lil more , live with what i have, and buy a nice insulated windbreaker thing to wear under my coat. space not really an issue as i where pretty large outer where, but any ideas or good brands that you know of that make a freaky warm base layer lemme know ! thank-you for looking and any response is greatly appreciated.