Today I'll teach you to make a casing or to sew elastic right onto the fabric. And when I say waist, this could be a drop-waist, natural waist, or empire waist seam (great for maternity!).
Making a Casing With Elastic
1. To make a casing in the middle of a garment, you'll need extra seam allowance at that seam. When I sewed my bodice to my skirt, I sewed my seam at 3/4".
Do the same as making a casing with elastic but don't leave an opening. Then cut two small slits only in the front of the casing, but not through all layers. Thread your tie through the holes.
Sew Elastic Onto Fabric
This can be done anywhere, on a seam or not.
1. Sew your bodice to your skirt with a regular seam allowance. I think mine was about 1/2".
I couldn't take a picture but I like to sew with my left hand in back and my right hand in front stretching the elastic. That's how I feel I get the most control.