Astral Version: astral-1.4.2
Patchouli Version: Patchouli-1.15.2-1.2-34
Forge Version: 1.15.2-forge-31.2.8

Normally, the player can be equipped with armor by activating a dispenser with armor in it while the player is standing in front of it. This holds true even when the player is in astral travel.