To do this, first soak wool dress in hot water. Then wash it at 60 degrees. You can also apply automatic spin in a washing machine for all wool fabrics, but the most subtle and delicate - cashmere and angora. Should not be dried on a clothesline or clothes hanger - it can stretch. It is best to spread it on an absorbent cloth in a warm place. As a result of these activities woolen dress should shrink.
If your dress is sewn from other materials will need to go the other way. Decide at what point you want to narrow or shorten the dress. The easiest way to do it with the hem. Just tuck it and kill it with pins. Then try on. If you all want, cut the excess fabric and hem hem.
The problem becomes more complicated if you want to, for example, take in the sleeve. To do this, first try on the dress and mark with pins or threads, how much you want to judge or shorten the dress. Then the seam on the sleeve will need to rip and make a new one, according to the marked line. In some cases, have even otparyvat sleeve from the main fabric dresses, for example, to narrow shoulder.
There is another method of repair - using darts. It is suitable in the case, if the dress is too wide at the waist or chest. To do this, first dart stabs pins in the form in which they will be stitched. If fitting dress looks better, then you need to tuck stitch on the appropriate line. Note, that they can change not only the size, but also to some extent dress style, for example, making it more body-fitting.