NET

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.

Darby

7 That disciple therefore whom Jesus loved says to Peter, It is the Lord. Simon Peter therefore, having heard that it was the Lord, girded his overcoat [on him] (for he was naked), and cast himself into the sea;

KJV

7 Therefore that disciple whom Jesus loved saith unto Peter, It is the Lord. Now when Simon Peter heard that it was the Lord, he girt [his] fisher's coat [unto him], (for he was naked,) and did cast himself into the sea.