Kids 50's Rock Star Greaser Costume Child 50's Greaser Jacket, Pants & Glasses Per Mftr. Small (Child 4-6 for 3-4 years), Medium (Child 8-10 for 5-7 years) and Large (Child 12-14 for 8-10 yrs) Mftr. has indicated 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 select by SIZE FIRST if you know it,