Elizabeth is now capable of pulling her bed away from the closet, opening the closet door and pulling out her costumes. By herself. Consequently she has been wearing them more often.
Sometimes she talks her parents into joining her (Daddy makes a lovely giraffe). Elizabeth's favourite costume by far is her fuzzy purple dinosaur, which she often doesn't want to take off.
That's how the littlest dinosaur ended up at the Museum of Nature (aka Dinosaur museum).