To keep with that tradion, you will find a range of directions on this page:

Making your own Rugby ball
1. Get your hands on a good piece of leather, app. 3' by 4'
2. Use a standard elliptical tool, combined with sewing chalk, to mark four ellipses on the leather.
3. Cut out the ellipses with a pair of Indian leather scissors.
4. Use a boilermaker stitch to sew the four parts together.
5. Inflate the ball.
6. Play rugby!