No,
You can find the Fallout 3 Section 8 armor mod on platforms like Nexus Mods or Mod DB, which host a variety of user-created content for the game. Additionally, checking forums dedicated to Fallout 3 modding, such as the Bethesda.net community or Reddit's r/Fallout, may lead you to alternative download links or recommendations from other players. Always ensure to download from trusted sources to avoid malware.
You would need to have the PC version of Fallout 3 and download a mod.
If you are using the Fallout Mod Manager (which is highly recommended) you can go to the tools toolbar and select Archive Invalidation. This may fix your problem.
In Fallout 3, there was a site called "Fallout 3 Nexus", from what I understand it was where everyone went for mods. Similarly, one was made for New Vegas named "Fallout New Vegas Nexus". You'll be able to find all the mods you could ever hope for there (just google it). Be sure to download the Mod Manager, it makes mods easier to use.
The best armor in that mod is Halite armor.
The unofficial patch often causes Fallout 3 to stop responding or crash to the desktop on Windows Vista and 7. It was fine on XP. You can uninstall the unofficial patch and install the newest official patch on any Windows version and it should run fine. Note that the PC version of Fallout 3 is quite buggy and contains many glitches that cause it to crash. Some have been fixed with the official patch and some were fixed by the modding community. Get a hold of Fallout Mod Manager (FOMM) and get a few game fix mods from The Nexus Forums (Fallout Nexus Mod Archive).
you cannot mod fallout 3 on xbox 360
There is a mod for skyrim which allows you to give your horse armour (it makes your horse practically invincible btw), but without the mod installed, horses can't wear armour.
To mod Fallout 3, you must download the G.E.C.K. from the Fallout 3 official site. You can not download it for PS3. I've tried myself.
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You cannot legally mod an Xbox Or Playstation copy of Fallout 3.