Hide in plain sight
Fancy top hats or pirate outfits may allow you to blend in a little better, but Altair needed nothing but his traditional assassin robes to hide in plain sight. Using the masses to fade into obscurity, acting like a praying priest, or simply sitting on a bench were just some of the methods Altair used to slip by unnoticed. While most of those are still present in later games, we rely far too little on the old so that we can experiment with the new.
The original Assassin’s Creed was arguably the stealthiest of the series, encouraging you to hide among the crowd to avoid detection. Combat proved to be very tough, making a sneaky approach a necessity when it came to completing missions and furthering the story. Its stealth mechanics are quite dated compared to today’s standards, but the verticality Assassin’s Creed introduced to the genre was relatively unheard of, combining fluid free-running with a detailed open world where the streets and rooftops alike were your shadow-drenched playgrounds.