Armor Suits are a combination of Armor in Biomutant. Armor Suits provide players with protection and resistances against all types of damage and negative status effects such as Heat, Cold, Biohazard, and more. Wearing Armor Suits also changes the character's appearance. Equipping all Suit pieces won't grant any additional effects.
Armor Suits can be obtained after completing certain Side Quests
Armor Suits in Biomutant