In A Separate Peace what action gives gene intense relief

"I spent as much time as I could alone in our room, trying to empty my mind of every thought, to forget where I was, even who I was. [ ...] I decided to put on his clothes. [ ...] This gave me such intense relief [ ...]. I would never stumble through the confusions of my own character again" (5.4-5).

This quote is directly from that piece of literature, showing that putting his clothes on instead of hers relaxes her.