This is called a "Stitch in Color" dress--it is so cute and has an easy tutorial
The Ocean Waves Skirt Tutorial by Julie Martin of ZozoBugBaby | Has a size chart for sizes 12-18m, 24m/2T, 3T-4T, 5T- 6/7, ,8, 9, and 10. If you don't want to, or can't sew ZozoBugBaby will be selling these in different colorways next week.
10 Minute DIY Infinity Scarf Tutorial
Amanda's Dress Pattern 12 months to 10 years by Lily Bird Studio $8.90