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The US Army is presently going to dress blues.
Military medals and insignia that you have earned are entirely appropriate for a black or white tie event when wearing a tuxedo or a dinner jacket. Wear them the same way you would for the corresponding military uniform - that is "mess dress" or "dinner dress." This generally means miniature medals and devices over the lapel of the jacket. Ribbons for which there is no medal, and and large medals should only be worn with the military uniforms.
they wear military camo cloths
a dailag for a soldier in a fancy dress competition
This may be an unpopular answer for some people, but the number ONE most world-wide recognized uniform is the U.S. Navy enlisted Dress Whites and Dress Blues ("crackerjacks"). Much of the reasoning is the U.S. Navy presence throughout the world, that is an advantage over other countries and other U.S. branches of military. The Marine Corps dress blues are most likely in your "top 5" HOWEVER...to the untrained eye, many civilians confuse Marine Corps and Army service and dress uniforms as they are (again, to the untrained eye) similar in appearance. Marine and Army service uniforms both include green slacks/trousers. Marine and Army dress blues both have blue trousers with single stripes down each side WITH a black jacket with trim around the edges. Conversely, with the U.S. Navy there is no mistaking the bell bottom trousers with flab on the back, "dixie cup" hat and chevron with crow on the left sleeve. U.S. Navy Corpsman 5 yrs stationed in 1st Marine Division
No, Marines are not authorized to wear their dress blues coat with jeans. The dress blues uniform is typically worn with appropriate uniform trousers or a skirt.
do you wear unit awards on the dress blues for a military ball
Yes
that is what you wear to the ball...
You may wear your uniform if you are a retiree. If you belong to the VFW or AmVets, etc, you may wear your post jackets and caps. Others, any dark suit will be fine.
Service Dress Blues
Yes when appropriate for the duty-it's called modified dress blues
Yes any member of the service may wear the dress blues.
The Marine Corps Ball is a formal event. Non military personnel attending should wear formal attire. Military Members will be wearing their "Full Dress" Uniform. For Marines that would be your Alphas or Dress Blues, with medals. This would be the civilian equivalent of a tuxedo.
You don't. If you are not a Marine or a registered Junior Marine it is illegal to wear any form of military uniform. If you want to wear dress blues outside the privacy of your own home then you must enlist in the Marine Corps, otherwise you could be caught, convicted, and become a felon.
Yes you do wear them. It is the same as your Class A Uniform
Yes, on the Marine Dress Blue "B" uniform.