go to your local grocery store and buy the largest pumpkin you can find. A 20cm diametre will be sufficient, but no less than 17.5.
Maybe buy more than one, in case something goes wrong with your first attempt, its likely to. Hollow out the pumpkin, using a warm ice-cream scoop and your bare hands. Tie a ribbon to your ears, this wont help you look like a pumpkin, its just for fun.
Paint your face and body orange, its best to do this two days in advance, as you need to dry. I find Dulux is the best brand to get the job done.
Jam the pumpkin upon your brows, making airholes to breath. Wear a spandex sparkly orange garment and hire a green wig.
Your sure to be the ‘belle of the ball’.