Why was Reuven not present when they sold Yosef? Where had he been?
Rashi #1: It was Reuven's turn to serve his father that day.
Targum Yonasan: In fact, he hoped that, if he returned Yosef to his father, he would forgive him for his sin .
Oznayim la'Torah (citing Pirkei de'R. Eliezer): Reuven went to meditate on one of the local mountains, with the intention of returning in the night to extricate Yosef from the pit and return him to his father. See Oanayim la'Torah DH 'Vayashav Reuven' #3.
Why did Reuven rewnt his clothes?