Double Or Triple Box-pleating
This is made by adding one or more pleats, one on top of the other.
Begin by making two or more pleats turning to the left, then the same
number turning to the right. Be very accurate, being careful to keep the
box pleat the exact width desired. Baste at the top and bottom. This
pleating is nearly always used by basting through the center, after
having slightly pressed. The top and bottom bastings are then removed.
The pleating may be caught together at top and bottom of box pleat, and
it is then known as rose pleating.