Peter, deck crew in the merchant service were not required to were a formal uniform, though they are often seen wearing thick jerseys provided by the shipping line and adorned with its name. Also Royal Navy style caps were provided if the men chose to wear them, though many preferred ordinary flat caps as worn by a great many working men ashore. Only the quartermasters wore a Royal Navy style tunic with the large 'Jack Tar' collar, as seen in both the large photos above.