Here's How

• Step 1: Enlarge all grid pattern pieces except rosette, (see bottom), onto tracing paper and cut out. Pin pieces onto fabric and trace 2 bags, 3 bag bases, 2 bag ties and 2 handles. Cut out pieces.
• Step 2: Trace, then cut out 1 bag base from cardboard and 1 bag from interfacing.
• Step 3: Pin, then stay stitch interfacing to wrong side of outer bag fabric piece.
• Step 4: 

  Transfer pattern markings on bag grid pattern to right side of outer bag

  fabric piece.
• Step 5: Stitch buttonholes where indicated on pattern, then cut open centres.
• 
  Step 6: Attach rosettes (if using) to centre of right side of bag where indicated on pattern, using picture below as a guide.
• Step 7: With right sides facing, stitch together bag short sides to make a tube.
• Step 8: Pin, then stay stitch pleats at 1 end of bag tube following arrows on pattern.
• Step 9: With right sides facing, fold handle fabric in half lengthways. Make 2 rows of gathering stitch 1.5cm and 2cm from folded edge. Turn right side out. Gather stitching until handle is 25cm in length, then tie off ends of thread to hold gathers. Trim thread. Repeat for remaining handle.
• Step 10: Pin each end of 1 handle at top of bag tube 3cm either side of bag seam. Flatten bag tube so seam sits in the centre. Pin remaining handle on opposite side to match first handle. Sew handles in place.
• Step 11: Sandwich cardboard bag base between 2 fabric bag bases, with right sides of fabric facing out. Pin fabric edges together, centring cardboard. Using zipper foot on machine, stitch as close as possible to edge of cardboard.
• Step 12: With right sides facing, pin base to pleated edge, positioning pleats at curved corners. Stitch in place.
• Step 13: For bag lining, with right sides facing, stitch short sides of remaining bag fabric together, leaving an 8cm opening 3cm from base edge.
• Step 14: Pin, then stay stitch pleats at 1 end of lining tube, following pattern arrows.
• Step 15: With right sides facing and seams matching, stitch bag top to lining top, enclosing handles as you go.
• Step 16: Push all top seam bulk to lining side of seam and edge stitch in place.
• Step 17: With right sides facing, pin, then stitch lining tube to remaining bag base, positioning pleats as for outer bag. (Do not catch bag.) Turn bag right side out by pulling through opening in lining. Stitch opening closed. Press. Push lining down into bag.
• Step 18: Stitch around entire bag at top and bottom of buttonholes to make a channel for bag tie.
• Step 19: With right sides facing, stitch 2 bag ties together at 1 end. Press seam open.
• Step 20: With right sides facing, fold tie in half lengthways and stitch 1cm in from folded edge. Turn right side out.
• Step 21: Fix the safety pin to 1 end of tie and thread it through a buttonhole and along a channel. When you reach buttonhole on the other side, pull tie out, create a small loop and continue threading tie through next channel. Now thread tie through both channels a second time coming out at the original entry. Sew ends of tie together, enclosing raw edges first. This will create another loop. Pull the 2 loops you made to close your drawstring bag. To open, put both hands inside bag, then pull hands apart.