I can't seem to find this information anywhere since the Uniform manual is so outdated.
I know cadets wear their chevrons on each side of the collar on the Lightweight Jacket, and an additional set on the shirt underneath;
However, is this the same for the Dress Blues Jacket? Are we "supposed" to wear another set underneath?
No, with a service coat it is coat only.
See photo on page 17 of 39-1 (though now worn on both collars of jacket.
(http://img837.imageshack.us/img837/7886/page17i.jpg)