In general, while vision is important for some species’ hunting behaviors, sharks generally look for contrast within the surrounding environment rather than a specific color or pattern, (i.e., “I see something over there” rather than “that looks exactly like my normal prey”). Indeed, many species of sharks are colorblind, and a paper I linked to above reports that.Given the lack of color vision in sharks, brightness contrast rather than color is likely to play a primary role in the detection and discrimination of ecologically relevant objects. Ironically, this contrast-focused vision means that the high-contrast sea snake pattern wetsuits that were promoted as a shark repellent a few years ago resulted in some concerns that swimmers wearing these would be highly visible to sharks, which may result in increased, not decreased, chances of shark bites. But those concerns were theoretical only, in the context of debunking the idea that these wetsuits were likely to REDUCE shark bites, they weren’t explicit warnings to avoid wearing them because they were likely to INCREASE shark bites.
I’ve seen concerns raised that bright, high-contrast colors and patterns may make swimmers, surfers, and divers more visible to sharks, and that shiny jewelry can reflect in the sunlight in a way that mimics fish scales, but advice to avoid wearing high-contrast colors and patterns is secondary to advice to stay close to shore with large groups of people in the middle of the day. Personally, I might be a little hesitant to dress up like a sea turtle if I was diving in an area where there were lots of sea turtle eating tiger sharks around, but even that is unlikely to pose a significant increase in risk to divers and swimmers—and the other Waterlust prints are either modeled after other sharks or species that aren’t prey.