Going further to the shoulders. Because our dress is made from elastic fabric, we will have to secure shoulder seams so that they do not stretch when you wear the dress. We are going to seam non-elastic bands in the shoulder seams. I use simple cotton:
Prepare and pin shoulders. Then pin the cotton bands.
Before sewing, take off the underneath pins. Sew with a straight stitch and serge together.
Press seams to the back.