Not a popular fashion accessory due to the hot weather, a scarf is something you seldom see people on the streets wearing on this sunny island. And Yuki is a good example since mine isn’t wearing one.
Then again, limited editions of Yuki do come with a scarf with colours like white, yellow, orange, pink or mint green. I have seen yellow like the one below stolen from here but not the other 4 colours. Additionally seems like other than scarf, a box of chocolate is included as well to commemorate its release on Valentine’s Day.
Just curious, do you own a figma Yuki? Does it comes with a scarf and chocolate?