That command has now sparked a debate about freedom, symbols and cultural dress in the United States. Lots of people of Scottish ancestry are protesting.
One quote I noticed is from Tom Wilson, a Texas commissioner for the Clan Gunn Society of North American, a Scottish heritage organization: "To say the traditional Scottish dress makes you look like a clown is a direct insult to people of Scottish heritage and those who live in Scotland."
You can read more in the Kansas City Star's web site at http://www.kansascity.com/mld/kansascity/news/local/13446523.htm.
I notice there is no mention of an apology or of a rescinding of the order by Principal Rick McClard.