Materials from that a school form is done some sewing must be natural. It, for example, a viscose, wool, silk or cotton. Synfils must not exceed a norm - 35%%. If a thing is executed from синтетики, then for her, as a rule, bad ventileness, as a result a child can sweat and feel discomfort. Often the producers of clothing for schoolchildren use blenderized fabrics in the production, id est, natural, but with synfils. Shirts, smocks, and also the suit lining must be executed only from natural fabrics, so as they run into the skin of child.