Here, this salty dog explains it pretty good: http://www.leatherneck.com/forums/showthread.php?t=75876
The same as you would wear any other awarded ribbon on the Army dress uniform. I have attached a link to this question to further assist you.
Any badge/ribbon you earn goes on them, just depends on whether you wear it in badge or ribbon form (Alphas/Bravos, etc)
Matilda has a red ribbon on her dress.
Air crew wings are worn on the dress blue uniform along with the shooting badge and ribbon rack. Medals are worn only for formal occasions.
There is no flag on the dress uniform
The "V" device is worn on the left side of the ribbon (as you look at it), with an oak leaf cluster on the right hand side [ V @ ]
The medal is the actual metal object attached to a band of ribbon that is displayed upon the uniform. A ribbon is worn upon the uniform in place of the actual medal. The ribbon has the same coloring bands as the band of ribbon on which the medal is hung. There are also ribbons awarded that don't have medals associated with them. The Presidential Unit Commendation, Sea Service Deployment Award are some examples. When wearing dress uniforms the actual medals are worn on the left breast and the ribbons for the non-medal items are shifted to the right breast.
An Army dress uniform is appropriate for ship's dress night on a cruise ship. However, the person wearing the uniform must be on active or reserve duty.
where do I inquire about getting sized for a set of Marine corp dress blue uniform?
Regular Class A uniform, which I think is now the Dress Blue Uniform.. when I was in, Class A was what is now called the Army Green Uniform. Either one will suffice.
A catagory of dress uniform style
There is no flag on the dress uniform