Universal will still allow T-shirts and other themed items. The line between costume and “themed outfit” is a blurry one, we suggest avoiding any prosthetics, fake blood, or makeup and stick to a shirt.
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And, yes you can bring your own Harry Potter robe from home to the theme parks. You will of course still have to follow the safety guidelines when it comes to wearing your Harry Potter robe on some of the rides at Universal!
What should I wear on a Harry Potter™ Studio tour? A. Many fans choose to dress up as their favourite characters from the series. Don't be afraid to get creative and wear your fandom on your sleeve.