DOA5 costumes and DLC are shown as "unavailable" for the PS4, what to do?

Some users have already posted screenshots like the following to the official DOA social network channels, saying that they are unable to buy or download certain content. It's currently not very clear what the cause of this is and how users can get this content.
Screenshot from German PSN store (Nicht verfügbar = unavailable; kostenlos = free)
Best Answer
Enable DLC for PS4
Here is what you need to do when you encounter these:
- Find the corresponding PS3 version of the item in the store and buy it. Yes, indeed. Even if you don't have the PS3 version of the game or you don't even own a PS3.
Return to the PS4 version of the item, it is now available as a free download. Install it and probably restart the game.
The center image shows that unavailable PS4 DLC becomes available after buying the PS3 version.
Old DLC and next-gen transfer
That's right, you were mistaken if you thought that previous DOA5 DLC will be free or discounted in DOA5LR and switching console makers probably easy or cheap. They said that you will be able to "transfer" DLC to the manufacturers next generation console and they obviously chose the most complex, difficult and irritating path if you come from another console. With Last Round you get the standard characters, the story mode, the 3 DLC characters (Marie Rose, Phase 4, Nyotengu), the 2 new Last Round characters (Honoka and Raidou), but you don't get any other DLC. There seems to be a bundle as expensive as the season pass with a lot of DLC from previous iterations and this doesn't seem to be a mistake or confusion with content specific to the free to play version of the game (core fighters).
Caveats and other known issues
- New DLC was only available with some significant delay on PSN-EU in the past while there was no unplanned delay or special necessary maintenance on Xbox.
- DLC management overall is handled very inconsistent and messy.
- You need to download all costume catalogs. (That's acceptable.)
- Whenever new costumes are released there is a new costume catalog. (Still okay.)
- Naming schemes and numbering have not been very inconsistent in the past. Some catalogs have been missing or required a special search in the store from the dashboard or the web, not through the DOA section of the store in the game. Another example for bad content management is the Marie Rose Overall costume, where you need to drop Marie from your query to find it through the web interface.
- Content transfer seems to only work from old to new generation consoles (at least on Xbox), so buy content on the old console if you still use it and want to be sure.
- There is no DLC transfer interoperability between Microsoft and Sony, but that was actually announced and somewhat expected.
I would have preferred if this had been communicated more clearer or their European support actually giving any(!) reply at all. They could have handled this similar to the bugs on the Xbox side during the launch (which was quite okay).
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How do you unlock costumes in DOA5?
Unlock All Unlockables You can unlock all of the game's music, costumes, Story Mode progress, movies, and more by pressing L1+L2+R1+R2 at the same time. Once you do so, the game should indicate that it is saving your progress.Does DOA5 last round come with all DLC?
Gameplay. Dead or Alive 5 Last Round features all the content from Dead or Alive 5 Ultimate, adding new costumes and customizable hairstyles for outside PlayStation 3 and Xbox 360 versions, as well as two new characters and two new stages for PlayStation 4 and Xbox One.How many costumes are in Dead or Alive 5?
This category is for the costumes in the 2012 title Dead or Alive 5, and its PlayStation Vita port Dead or Alive 5+. At the start of the game, the total number of costumes is 114, including both the default and unlockable costumes.PS4 HOW TO FIX “You are not able to purchase this product”
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Images: Gpress info, Андрей, Mikhail Nilov, Mikhail Nilov