Billowing sails

I was having trouble working out this effect and could not find a tutorial.
James W. and I have had a go at this this effect and worked on our first sail.
First we changed the sail to an editable poly and set the soft selection and the falloff on the planes vertices's.
We then added a animated wave modifier set the amplitude and the phase of the waves. On the wave modifier we also moved the gizmo to set the direction of the wave.
The final modifier used was a noise modifier to the plane. On this modifier we havled the scale, changed the strength and turn on the animate noise for the final effect which is shown below.