A rectangle of fabric 15 cm by 30cm
Small piece of fabric for the stalk
Sewing Needle (hand sewing needles and Sewing Machine Needles if using a machine)
Sew two lines of parallel stitches at the bottom of the square. This is to perform a gather. You can do this perfectly well with hand sewing, just pull the threads tight and tease the fabrics into gathers. I used a sewing machine, anchoring the threads at one end with a back stitch but not at the other, then pulling the threads to make the gathers.
Once you've gathered the fabric like this top stitch between the two lines of stitching to secure the gathers. Fold right side out. You should now have a little bag with an open top and gathered bottom.
With a hand sewing needle run a stitch along the top of the pumpkin, pull this tight and secure to create a ball.
To shape the groves into the pumpkin secure some strong thread with a stitch at the top and wrap it to the bottom of the pumpkin pulling tight, secure with a stitch and wrap the thread to the to and secure with a stitch repeat for as many grooves as you like. I started with four, equally spaced.