Lee Ann Torrans sends me an email – MYRMECOS – Insect …

How to Tack a Tutu

• On the inner tacks --- do rows two through four.
• As you move out in your tacking, do rows three through six.
• Then rows five through eight.
• I use upholstery thread and do a quilt tack about 3/4's of an inch wide..
• But you can just use a regular stitch.
  I am asked this often and should have addressed this a long time ago.
• I hope this helps now!

Obviously, the tighter you tack the flatter the tutu.
You can turn the tutu upside down and tack but this requires looser tacking -- because there will have to be some 'give' in the tacking for the layers to align.

Tacking will never create a pancake tutu. For that you need buckram. See Pancake Tutu.
For tight tacking put the tutu on a dress form or the actual dancer to get the alignment of layers right and then finish by turning the tutu upside down.