I do not recall ever hearing about a Mennonite or Amish Woman being groped.
Why do you suppose that is?
Could it be because they dress very modestly?
The way some women dress looks like they are sending out an invitation .....
Sorry, but Amish women are butt ass ugly.
While I agree with your conclusion that modest dress is protective, it's also true that women in these cloistered societies would not be as vulnerable as women in general society because they would be protected (or avenged) by their male family members away from the eyes of the law.
Those of us in mainstream society who have to make a living also have to put up with frequent harassment. If our fathers, brothers or husbands tried to "address" the situation, they would run the risk of being arrested.
Amish woman allegedly raped in her own home
Survivor Speaks Out Against Amish Rape Culture Ahead Of Sentencing
Man convicted of raping six formerly Amish girls in one family