CHILD Small (Size 4-6, 3-4 Yrs) Rainbow Glitter Witch Costume The costume includes the hat, belt and dress. Multi-Colored Toddler (Size 2-4T, 1-2 Yrs), Child Small (Size 4-6, 3-4 Yrs) and Child Medium (Size 8-10, 5-7 Yrs) Mftr. has changed sizing as above primarily because many people still think "size" should match "age" as when univ. sizing began years ago, yet children are "grown bigger" today - AND costumes tend a bit small. So purchase by Size 1st if you know it.