Armature literally translates to "armor". It's an interesting word choice in a love song, as armor is typically associated with protection in battle, not romance.
In the context of the song, the line "Buttiamo via queste armature" (Let's throw away this armor) suggests shedding emotional defenses and vulnerabilities to fully experience love. It's a powerful metaphor for letting go and embracing intimacy.
Emma's "Tra Passione E Lacrime" opens in a hot, cramped room, the morning after, where she looks at her lover and admits the imbalance: "Ma innocente non sei come me" ("But you aren't innocent like I am"). From there the song swings between wanting to run and wanting to stay.
The chorus lives on that swing: "Bellissimo, perderti per poi riaverti un attimo" ("Beautiful, losing you only to have you back for a moment"), "Tra passione e lacrime" ("Between passion and tears"). By the bridge she stops guarding herself altogether — "Buttiamo via queste armature" ("Let's throw away this armor"), "E trasformiamole in dolcissime paure" ("And let's turn them into very sweet fears") — trading protection for feeling everything at once.