Or one could pin it with a pennanular (pinned broach) over one shoulder. Usually this was the left shoulder for a right handed person and the right for a left handed person.
The feile mor could also be worn pinned at the neck for a cloak and the extra pulled up over the head for a hood. It was also used as your bed roll, lean-to (a crude tent) if needed, a truly versatile garment. When worn over the shoulder the tucked areas would form "pockets" in which to carry items.
Copyright 
1998 Historic Highlanders