The Kathryn Kelly Yellowstone Season 04 Vest is made from wool. Whether wear it with a casual suit or a formal one, its red color will enhance the look of anything worn under it. The inner side of the blazer is made of soft viscose fabric, which suggests that it is very cozy and comfortable. This red vest has a zipper closure along with a stand-up collar. Even though it is sleeveless, its wool material makes it warm enough to be worn during winters. Furthermore, the red vest has two waist pockets outside and two pockets inside.