Amish Life

What does “being Plain” mean for an Amish person?

Lately I’ve noticed a recurring theme across Amish America correspondence. Amish are known as “Plain People”, but given the many different Amish groups, what does “being Plain” actually mean?  Is there a litmus test for Plainness? For example: Is it based on width of hat brim, or style of prayer covering? Should your lawn be full of weeds, or is having a flower garden okay?…