John 13:4-5

13:4 he got up from the meal, removed his outer clothes, took a towel and tied it around himself. 13:5 He poured water into the washbasin and began to wash the disciples’ feet and to dry them with the towel he had wrapped around himself.

John 21:7

21:7 Then the disciple whom Jesus loved said to Peter, “It is the Lord!” So Simon Peter, when he heard that it was the Lord, tucked in his outer garment (for he had nothing on underneath it), and plunged into the sea.