And GMTO --> GROUP Made To Order. Just in case you were wondering.
Edit: While on this forum, MTO is usually referring to something customized from the normal offerings, you on occasion see it used to refer to shoes that were not in stock and were made to fulfill an order. Example: You go to the AE store for a 10D Walnut Strand and they have none, they check the central inventory and there are none in the system, so they will MTO you a pair. And yes I purposely chose one of the most common shoes for this example, only for effect.
Thank you for the clarification. Any other abreviations/acronyms I should know about?