First, turn your shirt inside out and put on the one who will wear it.
Then popliteus neatly with pins so that it is "sat". You need to fix the pins sleeves, side seams, raise the shoulder line. Sometimes you need to shorten the sleeve.
Carefully so the pins don't fall out, remove the thing, put it on a flat surface and carefully measure how much and where to pin. If, for example, the left side seam pinned 2 cm, right 3, then both sides need to reduce the width of 2.5 centimeters. Then record all final measurements.
Now you need to rip the shirt along the side seams, and shoulder. It should also be flogged, and to rip the sleeve. If you need to shorten the sleeve, then uplift the cuff, trim the necessary amount of tissue and again protocide her. Sometimes it's fairly easy to alter the buttons on the cuff, if sleeve is not very long and wide.
Cut the amount of fabric at the side seams. Almost always when this operation is required to reduce the shoulder length. Observing the data of their measurements, cut the necessary number of centimeters. Armhole sleeves will change, so the greatest challenge will be to carefully sew the new armhole sleeve. It is usually sutured on the same number of inches, and armhole. Be careful that the fabric does not pucker and does not interfere with the movements.
When it's sour cream and again arrange a fitting. You must make sure that the shirt is easy to lift and lower the arm that it is not crowded, and everything is symmetrical. If necessary, make changes, and then try again. When everything is correct, sour cream and prostrochite fabric, connecting all the parts.