This also applies if you are a small, junior or petite size in womens clothing. Sometimes it can be less expensive to buy large or Xlg clothing in the children's section. :
UGG | Shoes | Uggs Size 5 6 Big Kids | Poshmark
UGG | Shoes | Blue Kids Uggs Size 6 | Poshmark
UGG® Kids' Tasman II Suede Slippers (Youth) | Dillard's
Cardy II Knit Kids Ugg Australia Boots Chocolate Size 6 | eBay