http://i.imgur.com/yXv5qCa.jpg
I love Rin's December SR...god bless Kurocan for drawing Rin in this outfit, her scarf and earmuffs make her look so fluffy and warm and cute aaaaah~
Also, it's hilarious how Maki goes from the pure and innocent girl who still believes in Santa to "Kids, maybe ( ≖_≖)ﻭ ✧" in a single page.
Edit: I knew that Maki's outfit seemed familiar, but I couldn't quite put my finger on it until I stared at her skirt design on the cover page, since the distinctive flower pattern isn't replicated within the doujin itself, and her SIF card has a teddy bear blocking a good chunk of the upper half of her outfit. It's her Promo Christmas UR!
http://i.imgur.com/2Jvbxn7.jpg
Now to try and remember where I've seen Hanayo's outfit...
Edit #2: Finally realized that it wasn't a card from SIF - but from a song that was first previewed in the game. Hanayo's outfit is from the winter-themed cover of the Printemps album for "Eien Friends / Nightingale Love Song".
http://i.imgur.com/2bhsEVf.jpg
I'm very amused that the amount of time it took me to figure out these three corresponds with my usage of them in the game, i.e. Rin being my best girl, Christmas Maki being my first promo UR (and still a vital part of my admittedly weak Smile team), and the "Nightingale Love Song" token event being the first one I played from start to finish.