The uniform Magnus wore during his time in the Wratharis army. His mother kept it safe until the time was right for her to pass it on to Albea, and it's understandably very important to her, being the only connection in her possession to the brother she has never met. It seems like a lot of things would fit in the pockets of the jacket.
Attributes: Max HP Up, Jewels Obtained Up, Initial Jewels Up, Enables Master Ability "Showdown" when equipped on female units from Slothstein and their job type is "Machinist" or "Crafter" or when equipped on Lil' Ouroboros and her job type is "Continental Observer" (Raises own Missile ATK Power by 80% for one turn & raises Range by 1)
Stats by Rarity
Jewels Obtained +20
Initial Jewels +10