From what I hear one of the main reasons for wearing the 'extenders' on vests is to make them more comfortable in the hotter summer months. The extenders allow them to open a few inches in the front, depending on the extender length, and this allows air to circulate inside. The vest is still held together so it doesn't flap around, but that air circulating between your body and the vest makes a world of difference.
Also, fit over you, your long handles, your shirt, your extra shirt, your jacket liner, and your leather jacket during the winter.
Another great reason, which is (ahem) less popular to mention, but is a fact, is that we all gain weight and have certain clothes that we love but can't wear anymore. With vest extenders, it's a great way to hide those extra pounds and a way to keep wearing that beloved biker vest or even leather jackets if they snap up. What ever the case, if you're interested in buying vest extenders we have a large selection for the guys and gals here at The Cheap Place.
