Notes from author
My initial concept didn't involve having more than 2 ATT slots. But having 45 DEX made me wonder, what the hell--- wing it. I have long abandoned flipping katana builds, so no thank you. If you like THAT build, then go for it--- I'm not judging you. I'm just not interested. The VIT could be just down to 50 and redistribute the 3 points somewhere else.
If you long that much for extra firepower, you can swap the helmet for a Crown of Dusk and/or the Wolf Ring with the Bellowing Dragoncrest Ring. Chaos Blade and Uchigatana can be replace Iaito, provided that you either go for a lighter glove or removing/replacing the Composite Bow to compensate for the Blade's extra # of weight. Spells are also welcome for change.
The Wanderer Hood+Artorias' Armor combo is purely Fashion Souls. I don't rarely use the armor other than when I want to look dark yet awesome with its embraced-by-decay design or in an Artorias RP build. But the Thief's Mask, Tattered Cloth Hood, Hollow Thief's Hood and Gold-Hemmed Black Hood could work fine, too.
This is particularly for 1v1's, but if you can make it work on 2/3v1's then go for it.