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. Inside leg length: Place the measuring tape in the middle of the crotch and measure straight along the inside leg to the floor.

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

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