Universal Studios (both Orlando and Hollywood) maintains a general family-friendly dress code rather than a formal one. Guests are required to wear shoes and shirts at all times. The primary restrictions focus on safety and maintaining a positive environment: clothing with offensive language or graphics, anything that exposes excessive skin, or attire that could be mistaken for official staff or emergency personnel uniforms is prohibited. For example, shirts referencing violence or weapons may be flagged at security. During special events like Halloween Horror Nights, masks and full-face makeup are usually forbidden for guests to prevent confusion with "scare actors." From a practical standpoint, the "real" dress code involves wearing moisture-wicking fabrics and broken-in walking shoes to handle the 10,000+ steps you'll likely take. Since many rides use water (like Jurassic Park River Adventure), wearing quick-dry clothing is a pro-tip. While you can wear flip-flops, many high-speed coasters require them to be stowed or secured so they don't become "flying objects" during inversions or high-speed turns.