I'm also confused on the wardrobe changing, especially because early that morning he had what looked like dress clothes, then a casual outfit, and then at some point, took the casual outfit off. Did he have to meet with someone that morning where he wanted to look dressed up, and then after that was over, wanted to be more comfortable? That makes sense to me, but then why change again at some point? Was he maybe going to walk or do some sort of exercise after the dispensary, which is why he put on more casual clothes, but knew he'd need to change again for something later? He must not have been planning to go back to his home to change, since the clothes were found in the car.