2 adds sets of armor made from many blocks in game, including blocks from other mods! They have minecraft armor textures stats, depending on the block the armor is made from. Some armor sets also have effects when all four pieces of armor are worn. The armor texture also supports resource packs!
Lapis armor is made with Lapis Lazuli blocks, Obsidian armor made with obsidian, etc. Snow uses leather or a leather chestplate in place of some snow blocks. If other mods with blocks are added, there will be armor added for most of those blocks. Each item is crafted using the desired block in the shape the armor is normally crafted in, and can be repaired using that block as well.
Armor made from blocks with an animated texture will also have an animated texture. The armor textures will change with the block texture when a resource pack is added. You can easily choose to enable or disable any armor sets or set effects in the config. You can also change settings for the number of pieces required for set effects, whether or not set effects use durability, etc. On mac open finder, hold down ALT and click Go then Library in the top menu bar.