Pair our Black and White heavy flannel shirt jacket or shacket with an oversized long sleeve t-shirt. This look can flex from a sharp shirt or layering style to complete the look. 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.