Armor

Light or Partial Armor

Look, we get it. The shiny stuff is too expensive -- or perhaps you prefer not to carry around dozens of pounds in metal plates. This armor will get you by just fine (until it doesn't).

Type	Armor Class	Weight
Unarmored	2	0 lbs
Winter Clothing/furs	3	15 lbs
Boiled Leather	3	10 lbs
Gambeson	4	10 lbs
Mail Hauberk	4	12 lbs

Heavy Armor

RDR4 defines heavy armor as being capable of effective protection from neck to feet. Combined with a proper helmet, combatants wearing heavy armor become bona fide juggernauts.
To gain resistances, your helmet should should be appropriate for the armor or better.

Skull cap & Coif for mail armor

Closed face helmet for full plate armor

Type	Armor Class	Weight	Resistances when Wearing Helmet
Full Mail with Doublet	5	50 lbs	Cutting & Bashing Resistance
Brigandine	5	50 lbs	Cutting & Piercing Resistance
Full Plate Suit	8	90 lbs	Bashing & Piercing Resistance, Cutting Immunity

Helemts

These beauties will protect all those important bits up top. (main characters need not apply)
Mix and match for added effect. Combined armor bonus from head gear cannot exceed 2. Round down.

Type	Armor Bonus	Weight
Skull cap	0.5	5 lbs
Arming cap	.5	2 lbs
Coif	.5	6 lbs
Full Helmet	1.5	8 lbs
Closed Face Helmet	2	12 lbs

Warning: Closed face helmets incur disadvantage on all perception checks when visor is deployed.

Shields

Armor is great, but it still hurts to get walloped by a club no matter how protected you are. In the right hands, a shield can circumvent the need for armor all together.

Type	Armor Bonus	Weight
Improvised Shield	1 or 2	?
Buckler	2	5 lbs
Full Shield	5	15 lbs