If you don't
use a heavy weight wool, you can felt it to make it sturdier and more tightly woven.
Not exact matches
I suggest
using a good
heavy weight wool when
using it over night.
If you don't want to
use wool, another option is medium to
heavy weight wovens such as gabardine, brocade or twill.
These  3/4 length thermal pants from Odlo are manufactured
using a slightly
heavier weight blend of polyester and pure merino
wool creating the super warm Odlo Revolution TW Warm  3/4 Pants.