Just as different Christians interprete the Bible in different ways, some Muslims interprete the Koran in different ways.

Here's the Qu'ran verse that speaks to modesty: Qur'an 24:30-31 "Say to the believing men that they should lower their gaze and guard their modesty: That will make for greater purity for them: And Allah is well acquainted with all that they do. And say to the believing women that they should lower their gaze and guard their modesty; That they should not display their beauty and ornaments except what (must ordinarily) appear thereof; That they should draw their veils over their bosoms and not display their beauty Except to their husbands their fathers their husbands' fathers Their sons their husbands' sons Their brothers or their brothers' sons or Their sisters' sons or their women or The slaves whom their right hands possess or Male servants free of physical needs or Small children who have no sense of the shame of sex; And that they should not strike their feet in order to draw attention to their hidden ornaments. And O ye Believers! turn ye all together towards Allah that ye may attain Bliss." So the admonishment to cover one's "ornaments" is easily interpreted in different ways by different cultures and in different eras. I'm curious about the "strike their feet" part and what that has to do with modesty.

Some Muslim women act on hijab law completely(as Quran Explanation) and some did not act and do not wear hijab. here are some details for muslims women. https://www.dawateislami.net/blog/rights-of-women-in-islam

Whether or not their husbands beat them for not doing so!

The difference is that some will get stoned to death for exposing their faces.

I'd argue that covering the neck and hair has nothing to do with Islam, because women in the middle east were required to dress that way long before Islam existed. The Quran says only to dress modestly and cover the bosom; there is no mention of covering the hair. So, this is a tradition that is irreligious, but just so happens to be associated with Islam, because of the geographical overlap of Islamic traditions and classical middle eastern traditions.