Lee:
Conical hats like this are found throughout East Asia and, particularly, SEA. It may well be difficult to assign a direct origin to your example. Here is a photo from Wikipedia of all sorts of hats in a Chinese market. The ones stacked on the far left look similar to your's.
Yours looks Thai to me (and to my Thai friend who I shared your photos with). Here is a website selling a very similarly constructed hat (albeit not as well-made as your example):
http://www.thaicraftwarehouse.com/tc...p?fashid=51823
Best,
A