I work at a Starbucks (corporate owned store), and I see all varieties of cyclists. Roadies, MTBers, couriers, fixie riders, BMXers, cruisers, hybriders, etc. I'm one of them. They are also all in a variety of outfits from full kit to office apparel (sp?) and everything in between. I commute in on my road bike in spandex (it's so much more comfy that other clothes when sweating) and change in the bathroom. I usually talk shop with them when they come in. Of course this month, I try to sell them all a pound of coffee beans too. However, none of them ride with a cup in their hand (myself included). Most of them take a seat on the porch (outside seating) and chat with other people. I couldn't imagine trying to ride vehicularly with coffee in my hand.