Looks like chapter 10 of whatever this might cover it. Sounds like you should be G2G.
https://www.uscg.mil/Portals/0/OurOrganization/auxiliary/publications/AUXMAN.pdf?ver=2017-07-02-093004-213A.8. Formal
and Ceremonial
Occasions
Wearing of the Auxiliary uniform by active or retired Auxiliarists for formal
and ceremonial occasions is authorized as follows:
a. At civilian and military events requiring formal wear (Dinner Dress
Blue Jacket or Dinner Dress White Jacket). Auxiliarists who do not
own Dinner Dress Blue/White Jacket may wear Service Dress Blue.
b. Service Dress Blue or White may be worn on occasions where Coast
Guard and other military personnel wear the same uniform.
Coast Guard Uniform Regulations, COMDTINST M1020.6 (series),
authorizes retired Coast Guard personnel to wear the dress uniform that was
prescribed at the time of their retirement, or any dress uniform that is
currently authorized for active duty personnel, to certain formal and
ceremonial events. The same holds true for Auxiliarists in retired status.