The phrase "plaid wool" refers to a type of fabric that is both plaid (a pattern with crossed horizontal and vertical lines) and made from wool (a natural fiber typically taken from sheep). Full definition
A big basket holds a cozy plaid wool blanket, few extra pillows, and some more branches and cranberries for a natural touch. (lindsayhillinteriors.com)
While looking for cold weather patterns to mix, I found a yellow / black / white plaid jacket and black and white plaid wool pencil skirt. (joy.lookfab.com)
I own 1 black dress where the body con style is flattering so I sometimes wear it with a black and white plaid wool moto style jacket and wine colored shoes. (40plusstyle.com)