When Peter hears that the man on shore is the Lord, he girds his fisherman's coat around himself because he was "naked" and then throws himself into the sea.
Jesus in Context
Peter Girds His Fisherman's Garment
Before entering the water Peter fastens an outer garment around himself; John's statement that he was 'naked' need not mean that he had been completely unclothed.
Introduction
Historical and Cultural Context
The Greek ependytes denotes an outer garment. The word gymnos, translated "naked" in the KJV, can describe complete nakedness but can also refer to being stripped down or inadequately clothed by ordinary public standards. A fisherman engaged in strenuous work could remove an outer garment and work in lighter clothing.
To "gird" a garment meant arranging or fastening it so that it could be worn securely and movement would not be impeded.
Why It Matters
The clothing vocabulary removes an unnecessary modern assumption that Peter must have been working completely nude. The scene instead depicts a working fisherman quickly making himself appropriately dressed before rushing toward Jesus.