But, seriously, I'm just saying that the costume they show the Comedian in wasn't the final one he wore in the book. Furthermore, the director has said he cast younger actors in some roles because it was easier to age them with makeup than make middle aged actors look younger. Basically, he cast for the flashback scenes, not the "present day" scenes.
Based on all that, it's entirely possible that these aren't the "final" costumes the characters wear, but the ones they wear in the flashbacks.
