I went to a Khmer temple for a belated Khmer New Year festival in Fontana, CA last Sunday. A booth was selling clothes, mostly shirts, of anything Khmer. I saw some cool looking shirts. Based on the shirt from that link you gave me, I think you'd like the shirts there. Soooo, if your time permits you, try to come down to southern California for Khmer New Year some time in the future.
Since I'm old as fuck now, I personally got over those Khmer or any other kinds of shirts with various logos. The only exception is buying sports shirts....like the Lakers or Patriots. Okay, I'll accept a shirt with Bruce Lee's picture on there