First things first. Call social services to apply for an orphan reuniting permit.
Once you have the proper credentials, simply find a fantastic suit jacket...such as the Hermes I was working on. Carry it around the store looking for its mate. Start in the men's, the most likely place. Don't overlook the potential for it to be improperly paired with another jacket or on the floor under the rack. Changing room racks. Womens racks.
Keep your fingers crossed and your hopes down. There is no match more often than not, especially at stores like goodwill who have a central distribution center.
This is pro advice.
The Huntsmans I found were orphan jackets at first and I was really really bummed -- not for the flippability or tradeability, but just when you find something nice like that you grieve in general that it was separated...if you're a clothes dork like me, and if you're poasting here, you'd better be hahahaha
...and there they were, 4-5 racks away, together, just like the coats were paired in the coat section. Was not as successful with a corneliani found same day, different stoar.