Here are some professional schools for art and clothing design. If he has a natural talent, perhaps this is his field of work? They always say do something you love and it will never feel like work.
http://www.ask.com/web?q=Clothing%20...l&geo=US&ver=6
Also the is a forum on line that has many wonderful classes and reviews of patterns.
It is at
http://sewing.patternreview.com/
I am sure he could spend hours reading all of the wonderful information there.
If he is going to make clothing... buy him a dress form, pressing hams and some good long lasting tool and a great machine. Draping and using them for fit makes all of the difference in the world when it comes to a perfect fit and creative style.