Thanks to Nicole for bring up this thread. I should start by saying that my mother and grandmother were both dressmakers and that I started sewing doll clothes at 3 years old, and drafted my first "newspaper" pattern at the tender age of 8. I also, way back in the late 70s, received my degree in Fashion Design. I think the wool clothing would be great for the cold Montana winters. I live in the White Mountains of NH, so I do know a bit about staying warm in the winter. When I lived in cities and worked in offices, I loved to make myself and others basic wool skirts. You can easily draft some skirt patterns and change them up by adding pockets or trim. Don't forget the classic Celtic kilt for that matter. I wore a wool coat that I made myself for years and it was very soft and warm. Look for some nice wool in a heavier weight for the outer layer, then use an interlining of a soft felt type fabric, and a different lighter weight fabric for the lining. We do the same 3 layers for winter draperies. I also had a very warm cape that my mother made many years ago. I know that as rural residents, we tend to hang out in jeans and work wear, but there is no reason that we couldn't wear wool pants in the winter as well. I remember years ago, someone could not believe that I made a pair of wool pants, because the plaids were so well matched. All of this is very well, but as for thread, you will be hard pressed to find an all natural thread for the sewing. Most thread these days are polyester; it simply is stronger and holds together longer for a longer lasting garment. For winter clothing I would also recommend that you invest in more classic styles that will age better, and keep your summer lightweight clothes the trendier styles. Let's face it a light or white colored cotton garment will get soiled easier and therefore isn't expected to last, while a good wool skirt or coat could last for many years. I did recently order my husband some American Bison socks from National Geographic. They are expensive, but I waited for a sale. He loves them, they are warm and soft, and he always gets cold feet, so they were perfect.