I suggest a shorty wet suit or board shorts (surf shorts). And a UV rash guard would go with the surf shorts. It is a very popular combo here in Hawaii and on the US coasts. I would also recommend having someone in his out of the family circle tell him in a sort of off the cuff way that everyone has insecurities. I used to tell all of my team kids that if you act like you are confident, most other people think you are confident. And just for my two cents, a foreign language, music lessons to learn at least one instrument, and having a fitness instructor are things that will make his life better, guarranteed.