Insert the SLEEVE into the armhole of the garment, RIGHT SIDES TOGETHER.
Match seam lines at underarm point. Pin all around.
Hand sew a basting stitch all around the armhole within the seam allowance. Anchor one end of the thread to a pin using a figure of 8 motion. Gently pull the other end of the thread to gather the armhole seam allowance. Gather to the required length found on the pattern piece.
You may prefer to use a gathering foot. In which case set it to gather approximately every 6 stitches (depending on your stitch size – you may prefer to sew a sample to get the right gauge).
Cut two lengths of trim (measured against the lower edge of the sleeve pattern piece).
Fold the seam allowances as shown in the first diagram and stitch to secure.
Lay the trim RIGHT SIDES TOGETHER with the sleeve seam allowance. Stitch in place.
With the garment RIGHT SIDES OUT fold the trim to the inside. Top stitch to secure.
Repeat for the other sleeve.
Fold and secure the length of elastic trim for the neckline as in Step 6.
Evenly arrange the elastic around the neckline by folding the neckline in half twice to find the centre front and centre back. Mark with pins. Repeat with the elastic then match up the pins.
Ease the remaining neckline onto the elastic.
Stitch using zig-zag stitch.
You can use any type of hem finishing you prefer. You may like to use the same method of adding a trim as was used in Step 6 or perhaps a rolled hem.
Create a rolled hem by folding the hem back 75mm, then fold back once more 75mm to conceal the raw edge. Hem stitch by hand or sew on the machine to secure.
If you are using quite a wide trim, you can sew it RIGHT SIDES facing the interior of the garment, then fold it to the RIGHT SIDE of the garment concealing the seam allowance and topstitching along its upper edge. This is how the trim in the product images was applied.