if you saw him would you know him?

If you saw Severus Snape would you know it was him? If you wouldn't he is a sallow-faced, average height 53 year-old man with shoulder-length greasy black hair, a big hooked nose, cold beetle-black eyes and he always wears black.Severus Snape is almost always short-tempered.
When you see Snape from a distance he look's like an over-grown bat, sweeping around in his black cape.