I bought the BROWN version. It's a cocoa-colored brown that looks good on everyone. It covers the neck well, so it's very warm, but not at all uncomfortable. The round buttons are a nice accent and I think it's really cute.
I bought ivory and black. It was my first time buying this type of knitwear, so I bought two colors that seemed easy to use. They were neither too thick nor too thin, and were just the right temperature. Also, even though I don't like turtlenecks, I was able to wear them comfortably. I would like to try other colors when they are released, so I would like to buy multiple colors.