H3/B/U translates: draw center front line. from U downwards right angled to the waist line. (means the center front is perpendicular to the waistline from U downwards).
This line is also the grainline for the pattern, very important for striped fabric.
Corrections for the sleeve:
The forepart is nicely cut out...
The paper pattern get´s pinched along a vertical line starting at the front of the pocket for about 1-1,5cm at the hem, wich is the same amount as L5-L6. Thus a small belly dart opens itself at the pocket line and the under arm dart opens as well, achieving the two seam allowances necessary. (wich is not right btw, because the SA´s are already included in the underarm dart).
armhole width (Ad) of the jacket +10-10,5cm or
armhole width of the jacket + 5,5 or
1/3 of the jackets scye circumference ( measured 3/4 cm inwards from the scye line and reduced for 4,5cm wich is the SA of the shoulder, the underarm dart and the side seam) +1,5 or
D/e/L shifted front seam: 3cm outwards from center front line (wich is D/e/L).
d-d1 cut out height 1,5cm, measure one seam allowance (0,75cm) inwards
D/e/L shifted front seam, 1,5 cm inwards from center front
Shifted back seam:(usually the back seam would end in point C, by shifting the upper part of the seam to the underside of the sleeve, it dissapears when worn).