Is Wearing Hijab An Obligation What Makes Ghamidi Sahab's View Valid?
The verse you mentioned does not say that elderly ladies can expose their hair. It says they can expose their zeenat. It means that other woman should cover their zeenat. There is no mention of hijab there.
If that is the case that you are supposed to hide all external beautiful, make up would not be allowed as well then in front of non mahrams
How can we know what is in Sunnah and what not. Whenever ghamidi sb explained the command to cover zeenat he always said “whenever a woman is adorned then except hands face and feet she shouldn’t show anything else” He never said that it varies from culture to culture… And if the cloth used to cover chest is printed or decorated would that be impermissible to use?
The expert in Islamic Sciences, on the basis of their knowledge and argument, tells what the sunnah is and what is not a sunnah. You may know their argument and then decide. Exemption of face and hand is universal. The cultural differences are considered with respect to other details while determining the limits of covering and exposing other body parts. A colourful veil to cover the chest is fine, because it is a usual beautification which is not supposed to be covered, howeover, if it is adorned, it won’t serve the purpose.