2 Truthseeker,

In 1 Peter 3:1, ’so that if any of them….’ I understand this to mean that some of the women are married to unbelievers, though not all. The ‘if any’ seems to suggest to me that some might not be unsaved husbands.

You are correct. Peter defines his own terms and once again context is key. Obedience to the word or obedience to the gospel is used as a synonym for the unbeliever. See 1 Peter 4:17.

1 Peter 4:17 For it is time for judgment to begin with the household of God; and if it begins with us first, what will be the outcome for those who do not obey the gospel of God?

I also agree that Peter is telling all women to have an attitude of support (submission) to their husbands. It isn’t just the women who have unbelieving husbands who are to receive her submission but the ones who are not believers are especially able to see her godly behavior in contrast to the behavior of the women of the world.