Though Space 220 is an elevated sit-down dining experience, the restaurant is still in the middle of the Epcot theme park. There is no dress code for the restaurant, but I would encourage you to wear one step nicer for the evening. There are families in t-shirts dining at Space 220, but I was happy to be wearing a polo shirt for the experience. If only for the pictures, I always like to dress up a little more for sit down restaurants even when they are in the theme parks.