I cut little circles using the lining material and a small gutterman
thread spool end as a template. I drew the circles in pencil on the lining.
I cut them out one at a time. I threaded a needle with a single thread
and did a teensy running stitch around the edges of the circle.
For the male snaps I poked a tiny hole at this point into the center
of the circle. I pushed the “male” part thru the little hole.
I pulled up the gathering stitches around the snap. It was easy. I did
a few stitches to hold them closed. Then I went to the garment, without
cutting the thread, and started sewing the snaps on to the legs. I did
three stitches in each hole. I knotted the thread around a group of stitches,
passed it behind the fabric, and cut it off.
For the female snaps I poked a hole in the center hole with my applique
scissors after the snap was stitched to the garment. I think this is a
nice touch and as easy as any other snap application I could think of.