Power armor has vacsuit vacuum resistance
Makes the vanilla power armors give 32% vac resistance, and power armor helmets 69% vac resistance - just like the vacsuit's stats. This means you have 100% vacuum immunity wearing power armor.
The only DLC you need is Odyssey, it detects what DLCs you have and adds it to those.
special thanks to my silly dog for correcting the title spelling lol i wrote vaccuum
Mods this works for too:
Vanilla Armour Expanded
Vanilla Factions Expanded - Empire
Vanilla Factions Expanded - Pirates
if there's a mod you want me to make patches for you can drop a comment and I'll consider adding it. I've been told about this mod: [url=https://steamcommunity.com/sharedfiles/filedetails/?id=3531909708]TSIND Power Armor QA[/url] which offers the same thing but for a trillion other mods and a whole bunch of other stuff with lots of customization so that is another option if I'm lazy and don't add much in terms of mod compatability.