Knee length black leggings-where can I find some?

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I'd like some knee length black leggings to wear under short dresses/tunics.

Does anyone know where I can get some decent quality, reasonably priced ones please?

Thanks

I got some last summer at either asda or new look, sorry I can't remember which! X

I have some from Zara in black and navy but I bought them last year. They may well do them again this season?

I got some 3/4 length ones (just longer than knee) from Next, around £7-8 and good quality.

Asda. Primark has cropped ones too, ok for underneath stuff.

Thanks so much everyone-should be able to get some relatively easily then :)

I have some New Look ones that are great. They are made of viscose and keep their shape really well.