So .. here is the deal
I can't see npc armors and weapons in their equipment.(you can not steal them)

After I kill a npc I see them normally .

I have screenshots but i can't post links i think thats because I'm new at this forum

If the NPC is alive and has an item equipped, it will be hidden in inventory and cannot be stolen. That's the normal way the game handles this - it's not a bug.

You need to make 10 posts to the forum before you're allowed to post links.

Welcome to the forum, BTW.

Thanks for the fast answer .

And I have a another question
Is there a mod that allows me to steal the equipped items ?

I've never looked for one myself so I can't answer that one. But there probably is, and maybe someone else can point you to it.

I found this on the net, but i don't know if it's true. !!!! (So you should try it yourself.)

Have you leveled your pick-poketing to max and gave perks to all? it lets you steal anything of the target, even equipped things...

but some NPC's can't have clothes and weapons stolen. Examples: Victoria Vicci, Karliah, Vex...

So now about the mod you requested:

1) Non-playable Armor: http://www.nexusmods.com/skyrim/mods/820/?tab=1&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fmoddescription%2F%3Fid%3D820%26preview%3D&pUp=1

2) Non-playable Weapons and Ammo: http://www.nexusmods.com/skyrim/mods/2860/?tab=1&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fmoddescription%2F%3Fid%3D2860%26preview%3D&pUp=1

use: In console type player.additem ID # (ID = ID of item listed below, # = amount)

HOPE THIS HELPS...!!!!!!