I was curious about sizing for this as it just said Child Small.  It is perfect for my 3 1/2 year old.  She is a bit tall for her age but slender.  She loved this.  Santa brought it and she put it on immediately Christmas morning.  No breakfast, just dress-up.  I couldn't recommend it more.  For those who have to have a princess dress, this one is great.  It came with tiara, bracelet, necklace, dress, and "shoes" (which are useless but the kids like them.)

Buy it for the dedicated princess.