The various anabaptist faiths.... Mennonites, Amish, Hutterites, Shakers, Yoders, etc.
It is their religion
There is no specific religion that always wears denim skirts. Clothing choices can vary among individuals within a religion based on cultural and personal preferences. Some conservative Christian denominations may promote modest attire like long skirts, including denim skirts, but this is not a universal practice across all followers of that religion.
Because it is part of their religion and it is obligated to wear them.
Skirts that the Europeans in North America wore
No religion as a whole fits the description. Some Christian woman choose to wear skirts instead of trousers in order to avoid dressing as a male would or dressing immodestly.
I am pentecostal and I only wear skirts and dresses. So long jean skirts also count. I'm also sure that Apostolics are the same. And Jehova's witness do too!
Burets stripes and skirts
brethrens
The Aztecs and the Mayas wore skirts made out of bamboo tree leaves. They covered their genitals with leaves.
Islam is the religion and its sort of a custom for woman and girls and some of them cant even show their whole face
This description matches the beliefs and practices of the Assemblies of Yahweh, a Christian denomination that encourages women to wear skirts and encourages musical education for children.
The hoop wires themselves are made of two wires covered with either plastic or buckram. They're inserted into casings on the underside of the skirt, and most skirts have four to six wires spaced about 10 inches apart.