Yes, the astronauts wore their spacesuit (not pressure suit) before they even entered the capsule.
This solved the transition problem between sea level atmospheric pressure in the cabin and 5 psi once in orbit. One spacesuit with adds on according to the mission timing.

Cernan writes that paradoxically, between the moment they unhooked from the radio communication to walk to the van (on the ground), till the moment they hooked their hoses and wires into the Apollo cabin, they were in total silence, unable to hear people applauding , cheering...That was the most silent moment of their mission and they hadn't left the ground yet.