The hat and cape came from Simplicity 2327. It's so easy! I think you could do this with only a glue gun too. I embellished the hat with a felt mushroom I just improvised. Then, I used Marie-Madeline's tutorial for the fabric flowers on the cape.
The skirt is the Insa pattern from the book Sewing Clothes Kids Love. The Gnomeville fabric from Michael Miller really pulls the whole idea together.
The little elf shoes are a free pattern found here. Instead of a solid felt bottom on the shoes, I sewed an elastic strap that would just fit under Avery's shoes and hold everything in place. We're looking forward to costume days at Mother's Morning Out and storytime at the library.