I have just cut out the pattern pieces for the tea party sundress in size 6-12 m (digital version) and notice that the bodice and lining pattern pieces are not the same when laid flat. I am quite new to sewing and just want to confirm how to pin and sew the bodice to the lining. Am I to match the edges together and pin, allowing the pattern pieces to remain slightly different? Or should I sew them together as if they were meant to be the same size/shape? I suspect the former but want to be sure.