Dr James Hind¹ came up with the equation to determine the most suitable fabric² thickness depending on the weather conditions.

 

The 39-year-old says the secret to deciding what stockings to pop on the morning all depends on wind speed and temperature. The formula then helps calculate what denier, or thickness, to choose to avoid being too hot or cold throughout the day.

 

The mathematician³ designed the equation after he had to wear green stockings when he worked at the Tales of Robin⁴ Hood⁵, a former tourist attraction in Nottingham.

 

He said: 'I worked in tights day in and day out for a year and I know the value of properly warm tights on a cold day. I worked there 15 years ago in 1997. My 110 denier thick tights saved my life in the winter. I made those tights my basis for the formula because they should see anybody through cold and windy weather, and then when it's lovely and sunny, the denier recommendation reduces.'

 

The mathematician claims the complex-looking formula will work across the UK as it takes into consideration local weather conditions.

 

His formula builds the temperature (t) and wind speed (w) into a forecast to calculate the thickness of tights most appropriate. The equation uses the sigmoid curve to create a scale to determine the denier or density⁶ of fiber⁷ needed (d).

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