dom sweetie,
my memory is that Ohrbach's didn't get credited when the show was in a historical time period. The person who did the costumes, whether it was choosing from what Ohrbach's sent over or what was rented for the historical time periods, was Ramse Mostoller (later she used "Mostoller" tout court). I think she quit early in 1970 (and there's a letter from her in the DS letter book where she said she loved all of it EXCEPT working with DC and that is why she quit). A gent named Stanley Simmons took over after her, and then the final period was that woman who did the article in one of the KLS books but whose name is eluding me at the moment. I think she was the only one who made costumes from scratch for the show. I am pretty sure I have read in a reputable source that the historical costumes for 1795/6/7 and 1897 were rented.
G.