Not an opinion ...
1. military regulations can not be applied to a civilian.
2. if said person is no longer in the military (including ready reaserves) - regs do not apply (for Officers this may be different!)
3. if said person represented himself (other than the simple wearing of the uniform) as a member of the military - he “might” have violated some portions of the USC regarding the impersonation of an “officer”.
Correct. But the United States Code makes it a federal crime, in some circumstances, to wear an American Military Uniform, or decoration, except as authorized by military regulations.
You are wrong.
Federal statutes apply, not military regulations. You can not wear the uniform, or any part thereof, unless you meet the qualifications as stated in post #9.
By even participating in this Democrat booth, this woman is in violation of statutes, and, if still a memeber with military obligations (e.g., inactive Reserves) is in violation of military regulations.