Child R2D2
Perfect Costume for any toddler. Easy to get and keep on your kid. Additionally, they look even cuter than R2D2 himself. I wish I had thought of this when my kids were a little younger. I imagine you could do a variation on this and have something like Oscar the Grouch as well.
If you threw in a little battery pack with some blinky lights for the head it would be awesome. I just don’t know if you would be able to keep it on a 2 year old.