There’s a verse in the Quran where Mohammed said anyone wearing their clothes below their ankle is going to hell. Seriously.
In Turkey, IIRC the close fitting stocking caps were to signify the wearer had been on the haj. (pilgrimage to mecca) Back in the 80’s they weren’t very common but I’m sure they are now.
There are quotations in the Hadiths concerning this.
Abu Dawud Book 027, Hadith Number 4082.
Narated By Abu Sa'id al-Khudri :
AbdurRahman said: I asked Abu Sa'id al-Khudri about wearing lower garment.
He said: You have come to the man who knows it very well. The Apostle of Allah (pbuh) said: The way for a believer to wear a lower garment is to have it halfway down his legs and he is guilty of no sin if it comes halfway between that and the ankles, but what comes lower than the ankles is in Hell. On the day of Resurrection. Allah will not look at him who trails his lower garment conceitedly.