I know your Temperrr...
The hadith I told you about, when the prophet told her to show this and that... he didn't point to the hair so its prophet to show
Also the hijab must have few terms :
1. Thick enough to not show any part when get wet or under sunlight
2. Not to have accessories and be colorful
3. Loosely
4. Not to be perfumed
5. Not similar to Men's clothes
6. Not to be similar as nuns clothes or other Kaafirs
7. Not to be a fancy expensive dress so other people recognize her from others.