Spoiler-free ending advice with Phantom Liberty please?

[Eramidas]

I've beat the game already, a few years back, and I want to get the Aldecaldos jacket again. It puts you back to as if you never did that mission after you receive it and keep it, and my V is a Nomad so it's cool to have it. This makes me think maybe I can play multiple endings? I don't know anything about Phantom Liberty and how it ends, and I don't want to know anything about the DLC, I just want to go in blind, except this one thing. I am playing on a new character, new save, so I'm going through the main story again. I just now unlocked Phantom Liberty after completing the Voodoo boys section.

If I want the Aldecaldos jacket, but I want to play the new DLC ending, what do I do? Should I do one before the other? Or should I give up the aldecaldos jacket for the new ending?

[Dreepa]

You play phantom liberty first.
Then when you have the choice to side with SoMi or Reed for the first time, side with Reed for the absolute best and phenomenal next level (trust me, siding with SoMi is much worse content, less emotional, worse leveldesign, just lower quality in general).

In this next mission you get another chance to decide what to do with SoMi.
Do what she wants you to do and you will not see the Phantom Liberty ending, but you will be back in Night City, game continues as usual, you can do all the rest of the stuff and do a regular maingame ending. However, I think this is best ending emotionally speaking.

Or don't agree to do what SoMi wants you to do, which will lead you to a scene that allows you to trigger the Phantom Liberty ending.

However, my personal recommendation would be to check it on youtube afterwards, cause it's just not spectacular. Quite the opposite. It's kind of depressing. And it doesn't put you back into NightCity, so going through with it definitely ends the game.