Meaning of 澁 in Japanese

僕的にはもっと地味ってか渋い服が欲しいんですけどね。
For my tastes, I'd prefer plainer, or rather, more tasteful clothing.

まず目に飛び込んできたのは、大きなソファだ。渋い色の革張りで、座面も背もたれもゆったりしている。
The first thing that came to my attention was the large sofa. It was covered in sober coloured leather, the seat and the back both looked wide and comfortable.