Walt wasn't just wearing one, though he did have one tucked through the topmost buttonhole on his jacket, but he also had a small bunch of them wrapped in brown paper and tied with twine.
It was easy to tell why people often forgot he was there, it was because he had an entirely unassuming presence, and looked enough like a lot of people that he didn't really look like anyone, he was the penultimate everyman, really.
"And she sticks the landing!" He said, grinning, "Tach, I presume?"