I would be interested to hear what people knowledgeable about those three sources have to say, in particular kiltmakers.
I've ordered my first tweed kilt, which will also be my first kilt from USA Kilts.
Here is somebody else's kilt made in the exact fabric I'm getting, Hunting Stewart Weathered tweed from Marton Mills.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte