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Hangers carrying cotton trousers roll past us on an automated line, moving from one station to the next as the elastic waist is inserted and hemlines are finished.

Much like skirt hemlines, which supposedly get shorter in boom times and lengthen when the economy teeters, office holiday parties have never been immune to the flux of the broader corporate world.

So, the dress, which also featured a higher hemline, became a formal and universal choice of attire amongst women.

For months, the government largely looked the other way as bare heads proliferated across Iranian cities, hemlines got shorter and more Western-style clothing appeared in the streets.

Such practicalities are also at play in the Second World War when it's a shortage of material, not fashion, which keeps the hemlines high.