What you need:

• A blank piece of paper
   
• A pencil
   
• A ruler or measuring tape
   
• Socks (if you'll wear them with shoes)
   
• A wall or flat vertical surface
   

1. Place the paper on the floor against a wall.
Make sure it's flat and doesn’t move.

2. Put on socks (if needed), then stand on the paper.
Your heel should gently touch the wall.

3. Keep your weight on the foot you're measuri