To maintain the look of the raw or rinse washed denim, There are a few little rules you can follow.
Unless necessary, try not to wash denim as much as other garments. The indigo dyes will release both with wear and in the wash - it's best to preserve the dyes as long as possible. The less indigo lost at the beginning of the lifetime of the jean, the better and richer the wash will look in the long run.
Always wash the denim inside out in cold water. Avoid tumble dryers and don't use heavy detergents.
Some denim enthusiasts recommend that jeans should be hand washed only in cold water with a small cap of dishwashing liquid.
Due to the dyes used to create these denims, there may be excess colour remaining in a fabric. You should avoid any contact with light coloured garments, accessories and upholstery.
The raw or rinse washed jeans will shrink half a size after the first few washes. After wearing, these jeans will ease back up to their original size. The mid-level and lighter washed jeans won't shrink as they have already been through a long wash process.
Stretch jeans will grow to accommodate your shape and movements. After each wash they will shrink back to their original shape.