If you want to find armour without a cheat on GTA IV, it can be purchased from the weapons shop, once these have been unlocked for Niko. However, there are weapons and armour spread all over Liberty City which Niko can pick up for free. It you want to to know exactly where these are, you could either buy the strategy guide, or check game sites like gta.wiki.
2. There are two ways to gain armor parts.(1) The Armory gives you a certain amount of armor parts to use each day.(2) Robbing drops armor parts.
There is no single set that you need. Just make sure each of your mafia members has their own weapon, armor and vehicle. Buy/loot the best you can.
Armor can be purchased from the inventory section. You can also get special armor from doing jobs and winning fights
take a body armor and do crack till its silver
it is a random rare item from the Godfather 25pts
Mafia store in las Vegas
yes they add to the mafia family stats.
It is in the armor section
13 Attack 30 Defense
It was a limited edition item.
Click Inventory, then Armor.
Buy one. See Armor in Cuba