Ireland produces vast quantities of woollen knitwear and, under a US/Irish trade agreement, American visitors may not return to the States without a minimum of two sweaters, of which one at least must be predominantly green. Airline staff may check that you have the required documentation before you are allowed to disembark. Note: under no circumstances will you see an Irish person wearing a woollen jumper. These jumpers are worn solely by Americans to identify them to muggers, thieves and knackers.

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