ins Creed Brotherhood can't reequip Armor Of Brutus. =( >=( >=(?

Ok I'm playing ins Creed Brotherhood and I just got the Armor Of Brutus and I picked another piece of armor because it had better performance and I lost every piece of Armor Of Brutus and I went back to the chamber to get to the Armor of Brutus and it's not there and I checked at Ezio's Hideout and I can't find it...... Please help I really don't want to lose the ability for my armor to become unbreakable.... >=( >=( >=( >=( >=( >=( >=( >=( >=( >=(