Skin

Key 0
Block Rate 50%
Strength Required 1
Space Travel This armour cannot be used during space travel
You'll start off in your Skin, which blocks an impressive 50% of attacks. OK, most of that is probably assumed to be your general martial skill, but still. 50% is nice, but more is better—upgrade your armour at the first opportunity.
Compare Skin to other Armour
Cloth Armour

Related

Skin

Key a

Skin

Skin

Key A
Type Mundane
Skin is understandably the least protective armour in the game, but it's free and always available. Everyone starts off with Cloth Armour, though, so there's really no reason to ever use this.