When the weather turns cooler and the leaves turn shades of fall, we think our Mustard Heavy Flannel Shacket for men is a nice addition for your wardrobe. Add your favorite twill or vintage jeans and go for a hike or just chill. What is a SHACKET?? A Shacket is a blend of a shirt and jacket, except it's a bit oversized and looks like a shirt but made from a heavier material and while the heavier material helps distinguish the shacket piece of outerwear from a shirt, it's not fully a jacket.