I usually tuck some extra into my pack (sweat suit/pajama/extra blanket/fluffy sock, favorite goody), when my wife is along, than I would if I was hunting by myself or with a party, I run pretty light by myself.
She brings along her camera and lenses and I let her set the pace accordingly, if she wants to set up to take pictures, there is always plenty of time to harvest game and sometimes the only game we take is in pictures. Usually wind up with the extra stuff in my pack, but I don't mind it.
Actually, I spent a little bit more on her gear, than mine, but, it keeps her warm, dry and happy.