When Dan leaves the cabin to chop some wood for Julie he has his shirt on. When he returns to the cabin he is shirtless and has both hands full of chopped wood. After washing up and getting ready to eat Julie tells Dan to put his shirt on first. Dan reaches for his shirt which is now hanging over the back of a chair instead of being outside where he left it when he was chopping wood.
Women did wear pants in this era out of necessity, but these pants were not anything like those worn by Julie Reynolds Dolores Michaels. The pants would not have tailored to be form fitting and probably would have been denim blue or brown. Similarly her shirts would not have been form fitting.