This dressup is made up of one item from every CS birthday celebration, plus a pet from CS birthday 2011.
2016 - Avian Plush
2015 - Spring Background
2014 - Cake
2013 - Donut
2012 - Pinata
2011 - Cupcake
2010 - Party Hat
2009 - Mouse Plush
I'd have used one of the first CS pets, but sadly don't have any, and I didn't really want to try trading for one before the dressup challenge ends, so Cupcake gets the spotlight!
Happy birthday, CS!