Now, the humans in the audience will have a little more trouble here. In a perfect world, you’re pouring over these directions with a helper. However, we costumers are generally solitary souls, so you might well be doing this yourself. Be prepared to take the block on and off several times. If you’re relatively flexible, you should be able to reach behind yourself and, with the help of a mirror, mark your waist. You could also raid someone’s tool chest for a chalk line and run it around your waist – messy, but it will get you to the right place. You could use a long strip of masking tape at waist level. (Did I mention my hatred of tape? So ick.) I used to use a sort of “press test” – press your fingers into the bodice behind you, moving slowly upward from the bottom of the block. There will be a point where pressing on the block releases the pressure against your back at the bottom of the block below where your fingers are, but makes other parts of the bottom feel slightly more snug. This is the point where your back dips in, and where your bodice should sit in back. Depending on my weight, I find that this point is often above where the front of my body believes my waist is. Make little cuts up to this level (lower towards the sides, as seen above). Ideally, you should take the block off for this, and using a scissors on your own back is a Bad Idea.
Next … Adjusting the Straps!