Cut out all the pattern pieces including the interfacing and the lining (follow Lining Length Line on pattern pieces).
Lay the Back and Front interfacing onto the Wrong Side of the corresponding main garment pieces.
If you are using iron-on interfacing you can now iron it on. If you are using the sew-in variety simply pin in place.
Pin the Sleeve RS together with the main garment along the armscye.
Pin the ends first then the centre to the shoulder seam. Gently ease the gathered sleeve head to fit between the ease marks off the bodice. Gather more if necessary.
Pin in place and stitch the seam allowance, ensuring to stitch between the two hand sewn gathered stitch lines.