I have used doubled material for costumes, where modern fabrics just don't move right when used singly.

I would have said that the best way to use it is not to bond it together but simply fold it - so the fold is used as the bottom edge, iron the fabric carefully, tack it along the top to make sure the two layers are exactly matched up and then treat it as though it was one layer.

The tacking will allow some small adjustment as the pleats are formed but should keep the two layers close to alignment.

I have mainly used the doubling technique on lightweight fabrics containing some percentage of wool, and they did bond together after washing and pressing as a garment, which the poly cotton will not do - even so I would leave it as two layers so as not to lose the natural movement.

Unless it is to be a kilt worn only indoors, or always with a top coat or cloak outside, such light material is going to fly very easily as a single layer - in anything above a Force 2 it is going to be up around the ears more than down around the knees, if my own experience is anything to go by.

Anne the Pleater