Leather Armor
Leather armor is the first set available to Ezio, starting with the Sequence 1. Each piece of leather armor gives Ezio an additional health point, except for the chest armor, which gives him two health points for a total of five altogether when the full set of armor is worn. The spaulders are available immediately, the greaves and chest plate are available in Sequence 3 and the vambraces are available in Sequence 4.
Helmschmeid Armor
The second armor available is made from helmschmeid, which is leather with metal inlay plates. The greaves are available in Sequence 3 and give Ezio two points of health. The spaulders are available in Sequence 4 and give Ezio two points of health. Both the vambraces and chest guard are available in Sequence 5. The vambraces give you one point of health while the chest guard gives you three points for a total of eight health points for the entire set.
Metal Armor
The third set of armor is made from metal and is available starting with the greaves in Sequence 4, which add two points of health. The vambraces also add two points of health and are available in Sequence 6. The chest guard and spaulders are both available in Sequence 7 and the chest guard adds four points while the spaulders add three. The complete set gives Ezio a total of 11 health points.
Missaglias Armor
The final set of armor that can be bought from a blacksmith is made from stylized metal plates called missaglias. The greaves are available in Sequence 8 and add three health points. The vambraces also add three health points and are available in Sequence 9. The chest guard and spaulders are available in Sequence 10 and the chest guard adds five health points while the spaulders add four health points. The full set of armor adds 15 points to your health.
Altair's Armor
Altair's Armor is a special set of armor that cannot be bought at a blacksmith. The armor can only be unlocked if you receive all six assassin seals and bring them to Altair's tomb in Villa Auditore. The six seals are each located in a secret tomb -- Basilica Santa Maria del Fiore and Santa Maria Novella in Florence, Rocca Di Ravaldino in Forli, Basilica di San Marco and Santa Maria Della Visitazione in Venice and Torre Grossa in San Gimignano. The armor has the same stats as missaglias, however, it cannot break.