Construction:
1) draw to the fold of the fabric perpendicular. Lay off on the perpendicular value (1) - 1/2 mid svaga + 3 cm for processing.
А1Б = value (1) + 3 cm = 20 + 3 = 23 cm
2) fold delay value (3) - the depth of Smad 2 with k (2,5). k depends on the draped fabric.
k (2) - for dry, dense, hard-conformable tissue
k (2,5) - for soft, easily draped fabrics.
BV - depth Smad with k (2,5) = 45 x 2,5 = 112,5
3) From point B with radius - BV carry the arc. On the arc lay off 1/2 the length of the SAG - value (4) obtained by the measurement + 3 cm for processing. GW - 1/2 size (4) + 3 cm = 75 + 3 = 78 cm
4) Arc GW divide into 3 parts (26 cm), we obtain point D.
GD = 8.5 cm DD1 = 1 - 1.5 cm
5) Draw the final length of the SAG through the points G - D1 -
6) Connecting the points A1 and G, we obtain a value of the shoulder (2) with k Smad assemblies on a mounting tape
А1Г - shoulder Smad with a 2.5 k
7) mounting tapes primatives line ГА1Б. For this kruglitsa point A1 (for the convenience of primaqiune mounting tape)
Mounting tape is contracted only on the part ГА1 - shoulder Smad, and the middle А1Б processed, but not contracted.
This model can be cut, not only on the bias (45° angle), but also on the warp.