Mennonite Dress Code Amish/Mennonite Dress Code?

Amish/Mennonite dress code? - mennonite dress code

I read a book about the Amish life. The book claims that the Amish women, married and buried in the same white apron. Unfortunately, not say why young girls wear an apron, apron style, the girls wear an apron and a half of married women seem to wear an apron bibed all in a dark background color. Is there a spiritual and cultural reasons for this distinction in the dress / skirt styles.