I am a tad confused about how to sew up the side seams of the dress. It states to lift the facings from the dress halves and pin them together, to sew up the side seams, then in the next step to understitch the underarm and hand stitch the facing to the seam allowances. I think I understand these directions but I'm not quite sure I do. Is there a reason why you can't just stitch the facings in with the side seams (which is what I did inadvertently...)?
Thanks!