The dress code for the Buffet at the Bellagio in Las Vegas is officially "Casual," which is significantly more relaxed than the fine-dining restaurants located elsewhere in the resort. In 2026, you will see a wide variety of attire, ranging from tourists in t-shirts, shorts, and sneakers during the day to families in slightly dressier "smart casual" outfits for dinner. While the environment is informal, there are a few basic etiquette rules: guests are generally expected to be "fully clothed," meaning swimwear is strictly prohibited unless covered by a proper sundress or shirt and shorts. Tank tops for men and very revealing clothing are sometimes discouraged but rarely lead to a denial of entry unless they are deemed disruptive or "dirty." While you could wear a suit or a cocktail dress, you might feel overdressed compared to the majority of diners. The key is to be comfortable for a long meal while maintaining a level of neatness that respects the upscale setting of the Bellagio. If you plan on visiting a high-end lounge or a show immediately after your meal, opting for "nice jeans and a collared shirt" is the perfect middle ground.