long johns 
plural noun informal
Underpants with closely fitted legs that extend to the wearer’s ankles.Everyone wishes they had long johns under their jeans when it's 30 degrees and they're about to sit down in the car....
- All three boys were wearing bathrobes and long johns.
- Breathables do let the cold in, but if necessary the solution is to wear long johns under thermal fleece trousers.
- surface physics
- surface plane
- surface planer
- surface planing
- surface plate
- surface pressure
- surface-printed
- surface printing
- surface process
- surfacer
- surface rib
- surface road
- surface roller
- surface science
- surface scientist
- surface shelter
- surface speed
- surface structure
- surface tension
- surface-to-air
- surface-to-surface
- surface water
- surface waters
- surface wave
- surface winding