How do I measure correctly?

Take a pair of pants that fit you well from your closet, place them on a table and measure the measurements as follows:

1. Width: Lay the pants straight on the table and measure the width of the waistband from left to right.

2. Outer leg length: Place the measuring tape tightly under the waistband and measure along the outside of the leg to the floor.

Sizes may vary between 2-3 centimeters as they are measured by hand.