In the context of suntan, we normally expect that a person with dark hair and eyes is better able to acquire a suntan than a fair person. When we encounter deeply-tanned person with fair hair and eyes we say that the complexion offsets the tan. Similarly, if we saw a shabbily dressed man getting out of a Rolls-Royce, we might say that his wardrobe offsets his obvious wealth.
I do not think it is a very common usage.
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