More about social standing than religion as I understand it. The rule of thumb as I was told is basically: "is there any slight chance in I marry this person? If yes, hijab. If no, doesn't matter." Religion plays a role in such analysis, but considering a Muslim immigrant laborer versus some arbitrary Abrahamic doctor (for instance), the doctor would be more likely to see the hijab. (For married women, the husband decides)
Relatedly, I was surprised to learn that some women who "universally" wear a hijab before men feel no need to do so before a male immigrant.