Geoff Nicholson suggests sushi:
Indeed, the first rule of naked dining is this: Hot food is generally to be avoided. … Not only is [sushi] temperature-appropriate, but there are hundreds of years of history behind it, according to the Japanese traditions of nyotaimori (literally, "female body presentation") and nantaimori (the male version), whereby a naked body can be used as a kind of sushi buffet. Whether the diners are also naked is a matter of personal choice and, perhaps more important, restaurant policy.
His own experience eating nude in public:
When I had dinner in the restaurant of a clothing-optional resort in Florida—it was research, trust me—I was dreading it, and it definitely was awkward and embarrassing, but only for about five minutes. It took amazingly little time to get used to the abundance of, in this case, perfectly ordinary bare flesh all around me; if I had been surrounded by naked supermodels it would no doubt have been a different experience. But after those first few minutes it was just like eating in any other not-very-good resort restaurant. I seem to recall I had macaroni and cheese, and I laid out my napkin very carefully.
(Video via Robb Walsh's list of the Top Ten Food and Sex Scenes in the Movies)
The Dish 