WHAT
Ok so some fun facts here. Those are military shoulder straps. Most modern uniforms use them to affix epaulets that show rank to.
However their original use was to hold ammo bags, bayonets, and other military gear in place while it was slung over your shoulder.
The reason they show up on so many commercial jackets these days is because a lot of fashion designs have their roots in military uniform designs.
ruinedchildhood
