I saw a drawing of a character with a green-and-grey scarf for the attack rating examples on ArtFight. And I was wondering whether it was supposed to be a Slytherin scarf. So I scoured all the artist's profiles (which was a hefty task considering the sheer AMOUNT of art they have) and finally found a picture of the character. Luckily they linked the character's profile. So I looked through the gallery and behold, a really old ref said that the scarf was a Slytherin scarf. I don't know why I put in so much work to fulfill my HP fan squee. It's not even that big of a deal.