Sharks see contrast quite well, so for the sake of argument, I would think the olive or blue suits would be your best bet. However, as niro said, when a silhouette, color doesn't much matter.

Some more info here: http://www.flmnh.ufl.edu/fish/sharks/isaf/color.htm

The fact is that the CA & Baja coast line is prime great whites territory, yet there are few attacks. I think we need to give the GW's sensory systems a lot of credit - they are grabbing a lot of seals, and not people. If you look further into a lot of the attacks, most of them occur in bad water visibility (including this last case) - it's a case of mistaken identity. If you were going to worry about anything, a far better tactic would be to avoid water with less than 5 feet of visibility.

However, given the number of shark bites compared to the number of surfers and divers in the water every day, you should be worried about your commute to the ocean instead.

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