Thanks for the I sight. I will remeasure for the 100th time before I order. [emoji3]Unfortunately, that is where the inconsistency in QC sort of comes in to play. Both my Fed IV's are 58cm -- yet the standard one shrunk to the point of requiring a stretcher in less than a month of use. Whereas, the deluxe Fed IV fits perfectly. I think slightly larger is always going to be better since the hat will naturally shrink and conform to your head. At the same time, the Fed IV is a little larger at the get go in order to compensate for the conforming process. My head measures 58cm, I ordered 58cm, and both Akubras started out a bit large.
I think you'd be safe going with the 60cm and letting it naturally conform over a couple weeks of wear/steam.
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