Metabot's Manual of Magical Maneuvers

Runic Armor

1-level Transmutation

You inscribe a small glowing rune on one set of non-magical armor. For the duration of the spell, the armor becomes magical and can't be affected by other spells unless you choose for it to be. You have a +1 to AC and advantage on concentration checks while wearing this armor.
Until the spell ends, you can use a bonus action to speak a command word and don the armor instantly. The armor pieces assemble around you, piece by piece, ending with the helmet if it has one. If you end the spell, you can choose to magically doff the armor as well, which folds neatly into a pack.
Only you gain the benefits of this armor, if another creature dons the armor it is treated as a mundane piece of armor.
At higher levels: If you use a spell slot of 3rd level or higher, the Duration is 1 hour. If you use a spell slot of 5th level or higher, the Duration is 24 hours. If you use a 9th level spell slot, the spell lasts until it is dispelled. Using a spell slot of 5th level or higher grants a Duration that doesn't require Concentration.