While they certainly run larger, I'm hesitant to say that you should simply order a full size down as sizing goes up and down a whopping 1.5 inches. However, I usually wear a size 12 and the size 12-12.5 was a full inch larger than the taupe and mahogany. Ultimately, these two shoes are of the usual (excellent) quality that ECCO offers, but this particular model is a different size/larger than other ECCO shoe models, so just consider buying two sizes in the same color and then returning one that doesn't fit.
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