Black and Red

That looks awesome

Mine would look like this

But with a black hood with a black back but I would leave how the Cape looks like

The robes from Altair’s armor in AC2 would be mine

Pure Black

Mine would be black with gold accents using leather and holsters for firearms a sheath for a sword some plating underneath

God with the assassins there’s so many cool outfit ideas you can get just from the characters themselves. I would definitely be wearing a black suit and tie, hidden blades over the cuffs, a trench coat could hide a few pistols and bullets plus a sword cause why not, and obviously you gotta have a cloak so I would do a black cloak. As for the extra details I would have the Creed logo on my right shoulder of both the trench coat and suit jacket, a belt buckle with the assassins logo, and maybe a little badge on the left torso