Hey, Scott...
I bought the Harrison shirt, tie, and jacket from a Bonhams (London) auction back in late 1999 or 2000. The costume designer, Charles Knode, auctioned off everything he had left from the production. I was able to screen-match the shirt in many scenes, although there appears to be two different ones (of the same design) worn in the film. The tie also matched in some shots, and exhibited tears from when Zora strangles Deckard. Some impressive BR pieces were sold that day, and I was sadly unable to afford the trench coat. I paid quite a bit for the jacket, shirt, and tie, but not by today's standards. I used to collect original props and costumes pretty heavily back in the day. Not much left now, unfortunately.