It's not available now. It was part of an event I think. Youth Poem is the only outfit you can get by having more friends.

The recipe's should have been sent to your mailbox.

Try this
Hair: Dynamic Maiden or Sunflower
Top: Journalist Blue
Bottom: Sports Pirate Shorts
Coat: Trimmed T-shirt
Socks: Cotton Socks Blue
Shoes: Learning Journey
Headwear: Lace Bunny Ears
Makeup: Peach Sweetheart

I've tried a few dresses but none have worked. I think you just have to spend the time to craft the hibernation dress.