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keisanHigh-precision calculations for everyday life and work

Calculating the scaling factor for a jacket pattern

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When scaling a pattern, if the difference in the aspect ratio between the vertical and horizontal dimensions is too great, discrepancies can occur, such as the garment becoming too long.
Here is the formula for checking this.
Height
Size of the pattern to be used
Bust Size
Size of the pattern to be used
Vertical scaling factor 
Horizontal scaling factor 
Pattern sizes are calculated based on JIS standards: Size S (76 cm), Size M (bust 83 cm), and Size L (88 cm); corresponding heights are 152 cm for Size S, 158 cm for Size M, and 163 cm for Size L.

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