Taking accurate measures before you even cut a length of paper to start a draft is often the difference between being on the right path and utter frustration. A lot of problems can be traced back to faulty measurements. The pages below are from Whife's Art of Measuring. Which is really measuring information from various of his books brought together in one place.
Additionally, this (http://www.cutterandtailor.com/forum/index.php?showtopic=3225) thread about measuring for a coat, written by Schneidergott on the Cutter & Tailor, is an excellent measuring primer.
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