Can anyone tell me why (has anyone else noticed?) the 1983/84 Duke action figure appears to have TWO collars?

http://www.yojoe.com/action/83/83images/duke.shtml

It appears that he is wearing an olive green short-sleeved polo-type collared shirt UNDERNEATH his tan long-sleeved-button-up collarded shirt (with the tan shirt's sleeve's rolled up to just below his elbows).

I have NEVER heard of or seen anyone wear a polo or golf shirt UNDER a collared long-sleeved shirt (most people wear T-shirts under that type of shirt if they wear anything under it at all). It always looked very uncomfortable, scratchy, and way too hot and cumbersome.

Is this a military thing? Or did Hasbro designers just drop acid before they did the Duke V1 sculpt?

Always bothered me and I figured maybe someone on these boards would have some insight as to WHY?!??