Here is the pictorial for my all-cased elastic trainer.
The templates are here for the Small and Large sizes.
The templates are here for the Small and Large sizes.
Start with the (prepared pocket or pocket AIO) inner and outer laid faces inward.
Sew together close to the edges EXCEPT at the sides/hips of the back.
Turn through your pocket opening.
Sew all of your elastic casings.
Feed your elastics.
75%+ stretched through the legs, 50%+ across the back, and 25%+ across the front.
I use binder clips to hold my raw edges folded in.
Now for the stretchy hips...
Turn and sew your casings.
Pop just a few stitches across the middle to help with feeding.
Sew closed that side close to the edge after sewing all your elastics in.
Pin your hip panels into the body side openings.
Sew them in-place with your top-stitching. I also add a second seam for strength.
Add your snaps.
Here it is with a "China cheapie" insert inside. ;)