07-27-2012, 05:40 PM
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Short answer: there's not a reliable way to measure for a bridle.
Most online stores don't post the measurements of their bridles and just size them as "pony," "cob," "full," "oversize," etc. Those sizes vary in actual measurements from brand to brand, so you the same horse could be a cob in brand A and a full in brand B.
Depending on the breed & size of your draft, you likely need the largest size they make, and even that could be too small.