I attached it at each end of the inside of the collar and then pinned it at the center, and 1/4 marks. Then it was just a matter of pulling on the cartridge pleat strings and evenly distributing the pleats around the collar.
The band is attached to the pleats with a combination of blind-hem stitch and whip stitch. Most of the stitches are invisible.. and those that aren't, it's white thread against white linen. I'm OK with that.
In the picture, the blue dots were my guide for putting the cartridge pleating into place. They were made with a water soluable fabric pen so they should wash out the first time I throw it in the wash after it's finished.
