I confirm the comy feeling... I bought some in Tel Aviv from $5 a pair - needless to say the quality isn't top notch, but it gave me some ideas.
The pattern you found, Miyong, corresponds to the cut I have.
However, I really dig the ones shown in the first photo, but I suspect they are of a different cut (looks more flary at the legs, whereas mine are straight), unless there's a major secret twist in the tying of the belt that I haven't figured out.
Anyone knows a thai fisherman to ask for advice ? ;-)

Also I think it would be cool to make then of a somewhat thick cotton so that their own weight gives them a little intertia when you move. Mine are very very thin (cf $5), which is great in summer but they are prone to ripping and don't behave properly on a dancefloor...

I just received a pair of Thia fishermen's pants that I picked up off of eBay.(from Thialand) The pattern is totally different that the one shown here. It's just two panels with a cut out u-shape in the middle, ties front and back and the outside of the legs are open. Other than hems it only has one quick sew job of the U section. I think I am going to make a handful of these for Burning Man.

_Xak

Got some great linen fabric for this year, gonna try and pump out a couple pairs of these for my boyfriend this year! thanks so much :)

The pattern should say, "One Size Fits Most." I'm 6'1" tall with a 30" (Levi's, 34" actual) waist. The legs would've been a little snug, as measured in the pattern above, and way too short. So I added two inches the width and length. For a trial pair I made a them with $1.50/yd. (on sale) muslin. Now I'm going to make a few pairs with a better fabric.