The general recommendation for rigid jeans is that you add two inches to each of your regular waist and leg measurements - your Levi's® jeans will shrink-to-fit®. Remember not to alter the hem of your jeans until the shrinking process is complete, as they can shrink up to 10%.
How to make the jeans shrink till they fit
Put on your jeans and climb into a bath full of warm water for at
least 10 minutes. Drain the water away, squeeze the water out of the
fabric. Stand up and - if possible - let them dry
naturally while still wearing them. The jeans will mould about your body
and retain your form for optimum fit. Alternatively take
them off a place on a hanger to dry.
Subsequent washes
Make sure you turn the garment inside out and hand wash separately at
the recommended temperature of 40°C as the indigo colour is likely to
run. Avoid soap as this causes the indigo colour to
pale. The jeans will shrink over the course of the first three washes.
This will continue, if only slightly, until the
tenth wash. If you must machine wash, follow the same rule as above for
optimum results and minimal stress to the fabric. Always check the care label.