It’s totally fine to wear your jeans—ripped, dark, frosted, imported from Japan, whatever—to casual dining venues, such as the buffet, but the maître’d at a specialty dining restaurant may send you back to your room to change. It doesn’t matter if you’ve paired the jeans, even if they’re your dressiest, with a blazer or pussy-bow silk top and are wearing shiny leather dress shoes or heels. You’re still wearing jeans. For men, the ideal outfit is a polo or button-down shirt and dress slacks, and for women, a dress, pantsuit, or dress pants with a dressy top. Dress like you’re having dinner at your city’s fanciest restaurant.