This group is the most difficult to categorize. Women who fall into this category choose their clothes for their simplicity, classic style and ease of wear. While they still seek to express their religious convictions through what they wear, they also are much more likely to choose to blend in with the dominant fashion styles. Skirts and jumpers are popular, and trousers for women tend to be perfectly acceptable. Least likely of my religiously observant dress designations to choose to cover, women in this group are most likely to have shorter hair styles, as shorter can be simple and easy to care for. Makeup is often avoided as a statement on simplicity, but jewelry is common, particularly earrings. Actual plainness (solid colors, simple print, limited-palette wardrobes) is a hallmark of the plain-modern look. There are neither anachronisms nor symbolically and there are no traditionally important items.
Some plain modern resources:
GROW in the Increase of God, My Dear Children, and know all your Assurance in the Lord, and the Seed in every one of you, which the Promise of God is to. And be Obedient to the Just, and in the Truth of God walk, and the Love of it. And my Dear Hearts, in the Seed dwell, which gives the Victory over the World, and that in the Wisdom ye may be preserved, which bruises the contrary under foot; whereby ye may reign in the Life of God, to be as Nursers and Waterers of the Plants, and that all the Contrary may ...
I am not Amish or Mennonite, but some people who come to my website are interested in knowing more about these groups. I can recommend these books as authoritative and relatively inexpensive sources of further information.