I bought one Duofold Union Suit about two years ago. I never really thought that I would care for them. I had the usual "Long Johns"  Most of the day I was tucking in the tops or pulling up the bottoms. With the Union Suits you don't have to worry about that. They're warmer and more comfortable then Long Johns.

I also have two pairs of the cheaper cotton Union Suits but they do not compare with my Duofold Union Suit in comfort and warmth. The price is a bit stiff but if you work outside in the cold it is well worth it. They seem to be sized a little larger. I just ordered another set and it won't be my last!