I am a former Marine as my signature states. I have seen our uniforms used in much worse and insulting ways than someone wanting to alter one for formal events. I don't see this as much of an issue, due to the fact that a doublet has a militaristic styling. I hold everything about our beloved Corps as sacred, but since everything can be purchased at a surplus store, you have to let some things go. Uniforms don't make a Marine, earning the title does.