Okay so basically I manually installed a body mod and forgot to backup my files, can someone help me fix this?

If you still have the new body file still on hand you can look at it's files and see what it replaced and then get the corresponding vanilla files and replace the ones you're trying to get rid of.

You can re download the new body mod too if you deleted the download after installing.

Well, now I've installed the type 3 body, but I forgot to mention, the old body mod changed many of the female armors, is there any way to get those back to how they normally look?

Not sure of the exact location (usually it's: Data > Textures/Meshes > character > male) but it's pretty simple to ID by just locating the files in the character sub folders of both meshes & textures (Data). & just to be sure, open up the original body mod file to properly ID the names of it's folders, file paths & files. As for armor replacers (usually in: Data > Textures/Meshes > armor), delete the ones that are not located in subfolders.

Wait, I'm confused, did the mod overwrite the original files or did it add new ones?

That's why you need to look at the actual files but it will probably overwrite them.

If I understand this correctly, you had one body mod, and then installed another body mod correct? Are you trying to get back to the Vanilla Body?

I manually installed the type 6 body but I didn't like how it looked, and it also made many female armors into dumb looking skimpy things (I've seen worse on the nexus but still). Now i've installed the type 3 body over the type 6 and that works fine, but the skimpy armor is still there and it's annoying me. How can I get these back to the vanilla versions?

You should just be able to delete the files added by the Type 6. If you still have the Type 6 mod file and any other mods that corresponds to Type 6, still on your PC then cross reference what is in those files to what you have in your data folder and delete them.

Hope that helps!