Good point, but I guess that one should not try to dress Eden-like, unless he actually is Sir Anthony Eden.The hat is more formal than the overcoat.
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Usually I'm not afraid to push the boundaries, yet if I sported a full and coherent formal rig, hat to shoes, would feel too conspicuous and costumey, while I try to pass unnoticed instead.
Let's say that my aim is "clean living under difficult circumstances", by picking significant items from an era I think was better, but keeping in mind that said era is no more.