The fastener is a system used for close a garment. The brooch consists of two pieces of plastic or metal placed each on one side. The most simple are formed by one piece that is inserted in the other in a way they fit together. For attach them to the garment they are sewn by hand or riveted. Those riveted consist of four pieces that fit two to two. The fasteners can be seen seen or hidden when the garment is fasten up.
Elasticity is the characteristic of a fabric to stretch under an effort and to recover its original dimension. This property can be given by its structure or by the composition of the warp or warp yarn. The fabric elongation can be given vertically or warp and / or horizontal or weft.