Forum: I can't buy the deed for the American Stanadardbred, even though I have broken all 3 fast horses & have earned the Buckin' Awesome trophy. Earlier I had purchased the Hungarian Half-bred & Kentucky Saddler but now all 3 are "Not Available". Also, I can't buy the U.S. Army Uniform scrap at the Blackwater tailor, (it is also "Not Available"). I have all the other scraps for this uniform & have previously bought the scraps of the other outfits. I also can't change my outfits anymore although I could previously. I am thinking all these issues are related. I am 96.1% done, have completed all challenges & stranger missions.
Not being able to change outfits may simply be related to where you are in the game. Check out this support article.
For general game issues, deleting the Game Options file is a recommended troubleshooting step. This support article is not related to the problems you mentioned, but is an example of the recommended troubleshooting steps.