Most Zen monks in the west only wear their robes for ceremonial purposes. But I've found that when I'm on my way to or from the zendo and wearing my robes, strangers in the street will approach me, wanting to talk. It's not usually that they're interested in Buddhism, it's that they're lonely and feel isolated and need someone to talk to, and the robes give them an invitation, or maybe just an excuse, an icebreaker.