OK, here's how you do it. I'll give you an example from one of my own modded armors:
<armortype idname="ARMOR_NINJASUIT">
<make_difficulty>7</make_difficulty>
<make_price>200</make_price>
<armor>
<body>999</body>
<head>999</head>
<limbs>9999</limbs>
<fireprotection>true</fireprotection>
</armor>
<body_covering>
<head>true</head>
<conceals_face>true</conceals_face>
<arms>true</arms>
<legs>true</legs>
</body_covering>
<interrogation>
<drug_bonus>999</drug_bonus>
<assaultbonus>999</assaultbonus>
<basepower>999</basepower>
</interrogation>
<name>Ninja Costume</name>
<shortname>Ninja Costume</shortname>
<fencevalue>75</fencevalue>
<professionalism>100</professionalism>
<stealth_value>100</stealth_value>
Now, I would first suggest copying lets say Heavy Body Armor codes (find them in the XML) right after the Ninja Armor, which is the last armor on the list.
Now let's edit it. Say, you want the armor to be practically shake off bullets.
(Note: Any higher value will negate the armor value, i.e. your armor will be the equivalent of Mithril Chain-mail.)Oh, so you want it to cover the whole body?
But you must have the urge to
interrogate educate those die-hard
conservatives.
Now, everyone wants to be professional
and a ninja.
But nothing is like feeling of making it with your own blood, sweat, and tears.
Now let's give this masterpiece a name.
That's all I can think of for right now. That is as much as an Armor can be overpowered, I believe.
Note: You are not immortal in this armor. At the very best you will start bleeding profusely once you get hit. Do not expect to take on the conservative machine all by yourself with this over-the-top powered armor.
Also: You will need to add codes in.
EDIT: I would suggest modifying existing armors. If you add another armor in for some reason LCS will not play (for me). And do not rename the armors, or any armor, because the game, again, will not play (for me, anyway).
ANOTHER EDIT: I am using just a regular notepad, so I do not know what happens if you use XML Notepad. Operating them are more or less the same, though.