i am trying to find the mdl and the mdx for the sith armour in kotor 1. from kotor tools so i can make other armour or change the color of the armour from that model

If you want to recolor the armor, you shouldn't be looking for the model files. Are you just trying to do that? :)

If I understand right, you want to be able to edit the properties of the sith armor you use briefly as a disguise on Taris, and additionally to be able to make some different color variants of the same?

If that's the case, to change the properties of the armor, you'd want to use Kotor Tool and navigate to:
Kotor I >
RIMs >
Modules >
tar_m02aa_s.rim >
Blueprint, Item >
ptar_sitharmor.uti

That's the file for the armor properties (which isn't technically even armor. It's a disguise with a defense bonus of 2 built-in).

Now as for recolors, the texture files for the sith armors are located in:
Kotor I >
ERFs >
TexturePacks >
swpc_tex_tpa.erf >
N >
N_SithSoldier01.tpc
N_SithSoldier02.tpc
N_SithSoldier03.tpc

(You use 01. 02 and 03 are the same thing but with different colors already, like the red colored "leader" type and such)

I started to write up some detailed instructions on what to do with these files depending on what result you wanted to get, but then realized you very well may already know. Since for now, all you asked was where the files were, I'll leave it at that. :)

-Kitt

well with the sith armour i want to be able to make an armour like u can make your own lightsaber or sword. i would want to change it like removing the helmet or keeping the helmet and removing armour. i was also hoping to take the helmet a design different helmets from it. just where i can make my own custom armor from the sith diguise

Not to grump guys but isn't it better to mention the files a person requests and then try to troubleshoot and solve a problem in advance.

@akuma7802: I'm at work and can't tell you the model files off my head however I'll help walk you through finding them.

Open Appearance.2da and the ptar_sitharmor.uti files. Go to the Properties tab in the uti and you will find a disguise property. Reference the number there with your appearance.2da file going to that line number. Then scroll over depending on the appearance type your model will be listed there either prior to the racetex column. It likely is the same as the texture images listed by Kitty Kitty above of N_SithSoldier without the texture numbers listed. Then go to your models.bif and dig, dig, dig.

I realize this is the hardway. Now to keep from possibly breaking the animations I would recomend working with the Vert cords first. However Kha has a tut for replacing body parts.

i can not find the mdl where i can change or make i duplicate of the armour. i have looked eveywhere for it. i was hopping to make different types of helmets using the helmet off of the sith armour as a starter.

EDIT:
I found it thank u everyone now lets se what i can do with it whats the vert cord