KEEP YOUR SHIRT ON In bygone days shirts were a pretty expensive item of clothing. When a sailor decided to fight someone he would always take his shirt off prior to the commencement of fisticuffs. Hence a phrase used by those attempting to calm the situation was ‘keep your shirt on.’ The phrase has long since become common-place for meaning to keep calm and under control.

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Well spotted "Michaelplastics" and thanks for letting us know. We have now amended.
Best regards
Harbour Guides Crew