I don't like those tight ultra warm garments, they usually cost way to much for my budget any way. Years ago Walmart sold a very light under garment called Winterlites , haven't seen them for years other then I have 1 shirt left that is about done for. I searched the internet couple years ago but never found that light style, there were winterlites but they looked thicker and tighter.
Most my favorite cloths come 2nd hand, store or ebay. I like loose wool or acrylic shirts, I wear about any pants, if they are to light I have Carhart unlined bibs to put over them and underneath anything from cotton longjohns to flannel pajama bottoms although I prefer wool if I expect to be out all day in the cold. Cold weather I like insulated nylon shelled jackets or Gortex. Milder winter days a jean jacket or shirt over a flannel and under garment. Also wear flannel lined jean pants frequently in cold weather. I don't care what clothing is wore, if it is to tight, I''ll get cold. I used to put 2 pair socks on and crowd my feet, they'd be freezing in 15 20 minutes of frozen ground. Now I buy larger shoes and rarely use more then 1 pair of socks..They might not last as some socks, but I like diabetic socks for better blood circulation. They seem to breath well and stay dry good to.