And the lining! Temperature permitting, of course, but having a satin lining to your soft wool pants? It's not far off from pajamas. Of course it's often with some other clothes that are a little unpajamalike, like a stiff collar and a jacket, but a pair of half-lined pants are extremely comfortable.
Wool doesn't have to be warm! Tropical weights of wool are very light. But yes, lined pants are definitely warmer than without. Definitely less warm than a suit jacket, though.
