An improved inner jacket reconstructed for modern daily wear, based on the World War II–era “M-43 jacket.” While retaining classic military design elements, it adopts lightweight padded quilting with excellent heat retention, achieving high versatility that allows it to be worn as either an outer layer or an inner layer. A baseball collar is used at the neckline, adding a moderate sense of ease to the rugged military look. The front features an easy-to-use zip closure for smooth putting on and taking off. Practical pockets are placed at the waist, highlighting military-style functional beauty. The silhouette has a moderate amount of room, making it easy to layer over shirts or sweatshirts, and it also pairs well as a liner for M-65 or field jackets.