If you're going for an assassin avatar, or just any cloaked avatar period...

Emerald Dream's "L'Enfant Terrible Cape" pose combined with Infernal Spirit's "Dark Hood" is a perfect match, art style, shading, colors, design, all of it, 100% perfect.

If you look at my avatar right now, it's wearing this combo. (assuming you are reading this around the time this was posted)