This process is called - "shrinkage" and washing it can not be avoided because the tissue is exposed to various powders, gels and stain removers that act on new tissue so that the jeans slightly reduced.
For a long time took place the following way - jeans lowered into the water, and then, still wet, put on themselves. But in this embodiment, a bunch of cons - first, you can get sick, and, secondly, the skin absorbs the dye chemical elements that, of course, is very harmful to the body.
More intrusive option consists of several stages. The first - a wash in water temperature not exceeding 40 °. Do not wash jeans in the machine, it just lead to their "shrinkage." Soak them for a long time, too, is not necessary. And forget about baked - it also leads to a narrowing of the fabric.
After washing is necessary to expand a little dried up wet jeans on the ironing board, armed with gauze and carefully and slowly steamed cloth. Thus matter gradually podsyhaya, soften and keep the original shape. After jeans finally dried, they are much more pliable.
One way is as follows: foam dip a stretch shoes all the seams on the jeans, then put them on top and sprinkle a little. Then you need to look a bit like. This will help deal with the problem.
Another problem area - this unfortunate tummy, which does not give in to climb favorite jeans. Exit - wear them lying down. Then you need to get up and do a few movements, the fabric could get used to the body without causing problems later.
With each successive wash denim will become more docile. The main thing - to adhere to the above advice and use only a delicate kind of laundry, which will help preserve the original quality and also not to be less than the jeans several sizes.