Use this Vibha's PatternMagic tool if you have only one measurement and if you are stitching for readymade sizes. The above values are based on standard fit and you might have to adjust based on individual preferences. 

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For a perfect fit, use Vibha's Blouse Pattern calculator tool and enter all the measurements to draft pattern that fits perfectly.

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To learn how to take measurements, draft pattern, and to cut and stitch a saree blouse, check out the video tutorial from Vibha's Fashion here. Happy sewing!