While medals aren't required for civilian cloths I do like to bring them out for special events. Normally only about once a year and since it cost a fortune to have them mounted I need to get my money's worth occasionally.

Navy regs (been several threads on uniform regs) require, in civilian cloths, that medals can be worn if:

Black tie event
Mini medals
Worn on the same place on the jacket as if in Navy Mess Dress

The PC is very much like the Mess Dress Jacket -

5315.1 Male officers and CPO's, and E6 and below: on formal and dinner dress jackets, place the holding bar of the lowest row of miniature medals 3 inches below the notch, centered on the lapel, parallel to the deck.

Jim