Arcane University:Outfit Studio for Skyrim

Outfit Studio is an easy to use tool for customizing bodies and outfits, rigging and weight painting new bodies and outfits, and converting outfits between body types. If you're creating armor or jewelry in Blender it is much easier to rig and weight paint in Outfit Studio.

Outfit Studio also allows you to export and import NIF files, so it can work as a NIF to FBX/OBJ converter.
 * Outfit Studio for Legendary Edition
 * Outfit Studio for Special Edition

Once you've completed your low poly mesh and textures, import the FBX/OBJ into Outfit Studio, rig/weight paint your armor, and export as NIF. Your armor is now ready for Nifskope!

Tutorials

 * Outfit Studio Export
 * Rigging in Outfit Studio
 * Skyrim Armor Implementation Tutorial by Astolf (Youtube) Tutorial by AU Teacher that shows the process from start (exporting from Blender) to seeing it in-game.
 * Outfit Studio Installation (YouTube)
 * Outfit Studio Export (YouTube)