Hypnoshades are pair of digitally animated sunglasses from the Splatoon series. They're usually featured as a critical part of Callie'socto idol ensemble and is thus featured in a lot of cosplays of that specific outfit, but not always.
Danbooru asset #25063223: The physical design of the hypnoshades are seen on the left, while some of the different animated patterns are featured on the right.
