Nicola is in her angel era, donning yet another white outfit this week

On Friday, the supermodel gave a masterclass in transitional dressing, and managed to find a way to wear her sandals in spite of the season's dropping temperatures.

Alongside fabric content, one of the things you will pretty much always see listed in a hosiery product description is a 'denier' number. But what does it actually mean, and what do the different deniers look like?

Tights weather is here whether we like it or not. Click to see the black-tights outfits to wear with dresses this season.