I checked out that website. Wow, he has high prices. Also, a few things put up red flags.

We use metres, not yards of tartan. This means your kilt will have a decent amount of pure wool to give a nice ‘swish’!
This seems pretty pointless to me, as it's all a length of tartan, whether you're measuring it in yards or meters. Also, their "Superfine Luxury Kilts" has 10 meters in it...that's almost 11 yards of tartan. Don't you think that's a bit excessive for a kilt? Granted, it doesn't say what weight the wools it, but even in a Wisconsin winter I'm not sure I'd want to wear that thing.

Notice the photos too. I hope their "master kiltmaker" didn't take these photos, because somebody needs to teach these models how to wear a kilt!