Ependutēs refers to an outer garment or over-coat — the kind of clothing a worker would put on over their undergarment for labor. It appears only once in the NT, in the famous scene of Peter jumping into the Sea of Galilee to swim to Jesus on the shore after the resurrection.
The single NT use of ependutēs is remarkably vivid. Peter, fishing naked (or in minimal undergarment), hears it is the Lord and puts on his outer garment before leaping into the water — an almost comical act of reverence and urgency. He cannot be naked before the risen Christ. The image is theologically rich: our best response to the risen Lord is not dignified composure but urgent, clothed-in-whatever-we-have pursuit. Peter's gesture recalls Adam and Eve covering themselves before God — but now, in the new creation, we run toward God rather than hiding from Him.