Why was Peter Fishing Naked (John 21:7)? John 21: 7
  
  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.


Was he REALLY naked or just embarrassed? The Holy Bible seems to correlate nakedness with shamefulness.
The ESV renders the verse in question:


  That disciple whom Jesus loved therefore said to Peter, “It is the Lord!” When Simon Peter heard that it was the Lord, he put on his outer garment, for he was stripped for work, and threw himself into the sea.


It seems to contain the implication that he was wearing some kind of inner garment while working, and likely was not naked.