You can also go for the street-style by wearing them with a T-shirt or spicing things up with black knee-socks.

你也可以配上件T恤打造街头风格，或是穿上黑色长筒袜扮靓。

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They trekked from shop to shop in search of white knee-high socks.

他们疲惫地奔波于一家又一家商店，寻找高到膝盖的白色长筒袜。

《柯林斯英汉双解大词典》

According to this article, fashion retailers are expecting a run on argyle sweaters, knee socks and high boots for fall.

通过这篇文章可以看出，零售商们正期待着一种秋季时尚的来袭：菱形花纹的针织衫，及膝中袜，高筒靴。

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Pictured in school shorts, shirt, tie and school sweater and knee-length grey socks, (see the picture here) Kimani tells how had always regretted missing out on an education when he was young.

BBC: NEWS | UK | Magazine | The Magazine Monitor

Fox River Mills Inc. of Osage, Iowa, has six research and development employees who slide prototype socks onto a knee-high mannequin leg with pressure sensors installed that measure whether the fit is too tight.

WSJ: It Ain't Rocket Science, but Sock-Making Comes Close

For the moment, it's the socks used, game-worn (but washed) outer socks that come up to the knee, and Teixeira has seen his on-base plus slugging percentage rise 60 points since he put Sabathia's on.

WSJ: Teixeira Embraces the Power of Socks