There isn't any denying that it's more noticeable, but you have to remember that Amish/Mennonites are usually pretty secluded in their own communities so to them they aren't sticking out at all. The plain people are weird to them. Everyone in their community likely looks the same and limited to a particular dress pattern, but limited to solid colors and/or floral prints. Modesty in their communities aren't limited to the women only. The men don't wear buttons because it would be too easy to accidentally unbutton the top few buttons for comfort, or because of flashiness. There are other anabaptist/Mennonite churches who look exactly the same as everyone else.
I am anabaptist, but neither Mennonite or Amish - they are just other types of anabaptist. I explained the reasons for the way I dress in #11. There is a major difference between intentionally flashing a sign to the world and trying to draw attention or the impression of success through clothing, possessions, or whatever, and unintentionally drawing attention because you chose to live a modest life and Jesus is in it and has every part of your life - and if you do and people notice that, then I don't really see the problem.
I'm a big obnoxious, flashing light that can't be ignored - people notice it. That's fine. Either people will get offended (almost never), or in my experience, people will feel way WAY more comfortable discussing the gospel with you, sharing history, asking questions, needing advice, wanting to know more, opening their hearts up to something that they shut out for one reason or another long, long ago. That is not a problem in my eyes. That is a benefit.
"I have set you apart from all other people to be my very own."
Well. Okay then. If other people see it and they are more comfortable, then cool.
Edit: After writing the obnoxious light thing, brings to mind what Jesus said, "In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven."