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:
TO all the Elect, Chosen and Faithful, who . . . are the Gold tried in the Fire. Who have been tried by Goods spoiling, by Bonds, by Whippings, by Mockings and Reproaches . . . and some have been tried unto Death; and ye have proved to be the pure Gold, that hath come out brighter and brighter. Who have not feared the Waves of the Sea, nor the Winds; who fears not the Storms nor the Weather; whose Anchor holds, which is the Hope, the Mystery, which anchors the Soul which is Immortal, to the Immortal God. . . ...
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.