FWIW, a single button Eton jacket, as described here:

Clickety click!

Generally works in lieu of proper Prince Charlie or Argyle. Basically, think of it as a Prince Charlie jacket without the epaulets and buttons.

Since a lot of folks consider the epaulets and buttons holdovers from military mess kit anyway, they're generally unnecessary, unless your in the military.

And at about 1/10th of the cost!