The pants part of the costume, but may be a separate kind of clothing.
Suit trousers must match the cut of the jacket. Single pants can have a more varied cut: vertical seams in the middle of the front and rear halves, with the horizontal and curved yoke and Darts on the line of the knees, patch pockets, etc. Form, the length and silhouette of the pants mainly depend on the fashion trends. The pants can be wide throughout the length or narrow in some areas (hips, on the line of the knees), narrowed down or expanded, long or short.Suit trousers are sewn from the same fabric as the jacket, but depending on the style and purpose they can be made of fabric of a different color, matching color with the fabric of his jacket.
Trousers can be without a belt, with wide or narrow belt, with one or two elongated ends of the belt, with the belt loops or no belt loops, with side or without joints, with front closure buttons or zip. Side pockets can be placed at the side seams on the front half (in frame, with leaves) or in the seams of the front halves.
Depending on model there can be two rear pockets (in frame, with leaves) or one pocket with flap on the right side of the pants. The seam protecive belt on the front half of the handle pocket for hours with valve and without it. The bottom of the pants can be cuffed and uncuffed. Pants are sewn from woollen worsted fabrics or wool fabrics mixed with cotton or synthetic fibers. 
Summer can be made of cotton, linen or silk fabrics. 
Length of pants at side seam varies from growth to growth 4 cm, and from size to size does not change.
Sewing pants is not very difficult. Once is enough to analyze in detail the technology of tailoring, i.e. the sequence of manufacturing the basic units and components and their Assembly to learn how to sew any model. When using patterns from fashion magazines need to know what the main features to determine the size of the pants are: 
men - height, chest girth, waist girth; 
women - height, chest girth, thigh girth.
Depending on the size of the waist in men and hips in women measured the shape refers to varying polnocnej group. So, the man with the measuring 170 - 100 - 88 has growth III, size 50 polnocnej and belongs to group II. 
Women measure 164 - 96 - 104 correspond to the growth of the III, size 48, polnochnoe group II. This section offers basic design pants children's, men's, women's, classic straight fit, as well as options of the models on a stitched belt with various pockets, etc.
Technology of sewing of trousers may be slight differences in the methods of treatment depending on the kind of fabric. 
From material and processing method depends on the width of the seams in the product. The amount of stitches contained in the proposed designs of trousers, the same everywhere and is 10 mm except the middle seam, which is recommended with a minimum width of 20 mm and 30 mm. Stock in the middle of the belt of the trousers allows to increase the width of the pants at the waist.
Pants made of woolen, blended, cotton fabrics, medium density is recommended to scribble thread cotton No. 40, No. 50. For finishing lines in woolen fabrics and fabrics with various additives, it is preferable to use a thread of silk No. 33 and 65. The finishing stitches in cotton products perform cotton thread in color of fabric. 
Recommended machine needle No. 90 - 100. If the fabric is thin and easy porubitsya, you should use a machine needle No. 80.
If the fabric is very dense and often breaks the needle thread, you need to set the needle number 110 and sometimes no. 120 - 130 (for pants made of thick denim).
Manufacturer of denim pants, has a number of features. In some cases the necessary adjustment and setting the sewing machine to a more dense texture. Stitch machine set with the large size stitch (2 - 3 stitch 1 cm). Increase the height of the presser foot. It is recommended to use the thread of No. 30. The tension of both the lower and upper threads is reduced. Perform the finishing stitches of cotton thread in the color of the fabric, and contrast.