I have owned a handful of this style of Dodgers jacket, and seen several in auctions over the last 20 years, and have serious concerns with the "Koufax" jacket you reference. Please note the following from the lot description, "There are no labels, leading one to deduce that the jacket was probably made by Goodman or Tiernan, suppliers who were known to custom fit players and not include labels on occasion."
I have owned a 1958 Johnny Podres, with a letter from him stating it was worn by him in 1958. It had a small Wilson tag in the collar, with a small white size tag to the right. Likewise, I have owned a mid 1960's Howie Reed that was manufactured by MacGregor and had tagging present. Koufax played from 1958-1966. Based upon the previous Dodgers jackets from this era that I have owned, and seen in other collections and auctions, I am not aware of the interior being void of tagging (unless it was intentionally removed). Likewise, the statement that the jackets were "custom fit" is new to me. Maybe if Koufax was planning to have a 3-piece suit made, he might have it custom fit. A jacket? PLEASE! Furthermore, what is the assumption that Tiernan manufactured this particular #32 jacket or Goodmans based on?
Goodmans supplied the Dodgers with their knit jerseys from 1972-1986 (Rawlings the roads in 72/73). I have NEVER seen a Koufax era jacket manufactured by Goodmans, and have no information to support the claim that Tiernan was manufacturing Dodgers jackets.
How can this jacket be definitively sold as Koufax's? No tags, no way to pinpoint a specific year, and furthermore, what size is it? 40? 48? There is no mention!