What is generally accepted as the best mod for replacing the stock textures for Oblivion Vanilla Clothing on NPCs?

http://www.tesnexus.com/downloads/file.php?id=28643? (Adds random different colored clothes so that everything isn't so drab and generic.)

http://www.tesnexus.com/downloads/file.php?id=24078? (Makes the clothing/armor for females match the HGEC body)

If you're asking for like mods that simply add hi-res replacement textures then... I'm not aware of anything like that.

There are mods that turn everything worn by females into much skimpier versions, but I doubt thats what you're looking for.

http://www.tesnexus.com/downloads/file.php?id=7487?