I have a couple sets of excellent synthetic long johns, very light, that came from Good Will. Yes, new -- they have lots of new stuff. For non-cold use, I use synthetic athletic-type underwear with a generous waist band. I have gotten good use from my Costco ones, but the clear champs are UnderArmour. I just can't believe how long their elastic waists last. I have had some for 10 years and have fluctuated in weight by over 30 lbs, yet it still fits right and stays right.

I am thick of thigh and prefer "long" short underwear. Cotton need not apply except for sleeping at home in the winter. Nor wool. Nor blends of same.

I do not entertain hypotheticals. The world itself is vexing enough. -- Col. Stonehill