The special tailoring of the 30-40's USMC or USN training garment, compared with the current garment collar, the collar of the old era is flat, similar to the settings of a word collar, which is conducive to the sailor to take off quickly after falling into the water. In order to facilitate movement, the shoulder width is very wide, close to the chest or even more than the chest, which has obvious shoulder slipping effect. The length of clothing is shorter and has V-NECK settings. The layout of this product is cut according to the first year's cutting, the fabric is also close to the first year's thickness and texture, rather than blindly thickening, because thickening means adjusting to a higher density, but at the same time the density will lose a part of ductility. At present, this weight is set after weighing the pros and cons, only showing yuan. The sense of repetition is truly meaningful. Flat neckline, shoulder shoulder, cylinder without joint, short body ruling, first year texture, durable washing.