Never accept a flat rule for all blankets. The blanket sizing can vary a bit depending on the brand and the cut. Always try to find a sizing chart for the specific brand/model you're looking at. A wide horse or a narrow horse can affect the fit as well.
For example, my horse fits in blankets from 68-72 depending on the blanket. A 70 is usually the best fit but the first rain sheet I got him ran huge and fitted more like a 74.
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