Blazer Pattern drafting in Gerber

• Mans tailored Blazer ...
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The Back
W-RT = Back depth of scye----=23.5cm
1/3 = 1/3rd back depth of scye-=7.6cm
T = Waist length--------------------=45cm
G = Depth of seat----------- =63.3cm
L = length =78 cm
L-L1 = displace by 2-------------=2 cm
L-W = join with straight line
T1-T2 = displace in by 1.5 for waist
L1-L2 = displace by 2
L2-T2-1/3 = join with straight line
R-RB = width of back--------------- =21.5.cm
RB-S = side point height = 6
S-S1 = displace to the side by 1.5
RB-SH = add shoulder height here (the shoulder seam is advanced and is given a 0.5cm ease to allow for the canvas)
W-H = 1/10th of half the chest + 3=8cm
H-HS =1/10th of back depth of scye=2.4cm
HS-SL = cut along length of shoulder (the shoulder width becomes 0.5cm narrower)
T2-T3 = R-RB minus 3.5 (the back is displaced 0.5cm on the waistline)
L2-L3 = T2-T3 + 0.5

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Plz explain in details with voice,