Interestingly if you go to the PSN website instead of trying to do it through the actual PS4 tab there are more costumes listed there.
However, you can only buy bundles of all the costumes for a specific character for the PS4 version (for example you could buy all of Marie Rose's costumes but not an individual one). I wonder if that's all the PS4 will get? If so that kinda sucks.
The previously purchased costumes not showing up is complete bullshit though.
It's a real shame, the game's a lot of fun, would've been nice if it could've had a clean release and I could've given them a little bit extra for a couple costumes.