If as your skin is Olive you can use selected hair shade for
instance Dark Dirty Blond, Milk Chocolate color, Blackish Brown,Classic
Brunette,Dark Chocolate and Orangish Blond those are popular hair color for
Olive Skin.
Some fair-skinned ethnicities have light skin tones that can darken after being exposed to the sun, giving them a natural tan that tilts towards olive. They too can be classified as olive although not entirely, since their skin darkens briefly before eventually returning to its rightful tone.
Source: pinterest