Suits are generally divided into three-piece and four-piece. The more open bodies they have, the better the clothes they make. The sleeves are the same. The sleeves of casual loose clothes generally consist of only one sleeve. The suit emphasizes self-cultivation and shaping, so in order to achieve this goal, the sleeve of the suit was split into two pieces, which led to the big sleeve piece and small sleeve piece of the suit.

2. Sleeve-up: First find the micro-point of the cut piece, locate it with cotton thread, and pay attention to the seam amount of 2~3cm on the armhole arc and the armhole half arc, and then turn over the seam.

3. Collar problem: The lower collar piece should be spliced by two pieces of diagonal yarns, which has good deformability and can better fit the curve of the collar. When sewing, it provides modeling support for the spirit piece as a whole. First, combine the lower collar piece, sew three sides of the collar, knock the needle back and forth, and pay attention to the uniform sewing amount of the lower collar piece when sewing to the long side (the specific position and sewing size will be explained in detail in the textbook). After sewing, turn it over and iron it according to the shape of the collar curve

Read the rest of the textbooks carefully. If you still don't understand, you can ask a tailor who can sew a suit on the street.