from the previous step:
1. You conserved elastic:
you take your first mitten saver (clip still attached) and you cut the elastic so it is around 14cm long.
From the same piece of elastic, you will cut a ~16cm piece of elastic. Hem one end, thread the clip through and sew close to the clip. Do the same with the other end.
2. You didn't conserve elastic:
you have already cut each fixed suspender clip so that it has a 14cm piece of elastic attached.
for each piece, thread a clip through the elastic. Fold the elastic over twice, making a good hem. Stitch the width of each elastic so that the clip is permanently in place.