I haven't read every book so I'll take your word on "kilted" being mentioned
I'm not fond of the way the dress styles are changing. I miss the kilted/tuniced man in sandals too. There are a few here and there, but most have changed over to boots, pants and long tunics or shirts with a bazillion spiky accessories. At the same time, there were far too many warriors in black "back in the day" too. This has been a long standing complaint by Gorean rp'ers and isn't really anything recent.
You want to know where they are. Well that answer is simple. They're spread out all over Gor. There isn't any one sim (that I've seen) that has a saturation of tunic wearing warriors in it. From the highest traffic to the lowest traffic - best rp to worst rp, many warriors are in pants and black. Not all, but a lot. I'm even seeing men dressed like they just stepped out of GE in one very popular high traffic sim, Who Shall Remain Nameless but starts with a T and ends in an emos.
I have to disagree on the builds. Some of these new mesh builds are really very good. Turia, in it's last rebuild, had a pretty good mesh build while it lasted (kaboom). I'm seeing a lot more of the narrow street builds (though Turia's were a little wide for my taste) and less of the huge empty street with a line of buildings along the side (Nsykos, for example). I think we're coming out of the old build styles and moving into some really good ones. Ironhall has a very beautiful build this time around.
You'll just have to hop around and take a look to see which of the sims out there is the lesser evil. That's how I find places to play. Perfect doesn't exist. "That'll do" is all that's out there.