My DD is 14 month old and has recently discovered that she is in fact the baby in the mirror. Since then, she has been posing with all sorts of props: my glasses, nappy over her head (clean, thankfully!), looking at herself with/without dummy. It’s made me think she might enjoy a little dress up box as she grows.
I would love to hear about your toddler props and costumes. So far, all I have are some bear ears. I was thinking that charity shops might be a good start.