Incogneato has come out with a line of Karate Kid costumes and, as a child of the 80's, I LOVE them ;-)
Just a few choice pieces:
Karate Kid Cobra Kai Adult Gi Costume
Karate Kid Cobra Kai Skeleton Adult Costume
Karate Kid Daniel-San Adult Gi Costume
You can view the rest of the Karate Kid line here and I'll see you in Reseda!