Memoi Spot on Basics Ribbed cotton sweater tights are model SP-3405.  These cotton ribbed tights are very economical.  Great for school and to keep girls and ladies cozy and comfortable. These tights run a little bigger than other brands.  Regarding size, if a girl is just starting to wear size 8-10 in Butterfly then she'd probably take size 6 in Memoi.  I have found the adult sizes Petite, Average, and Tall run a bit big in the foot.  If you have a foot smaller than size 7 or 7 1/2 this product might be too big in the adult sizes.  I haven't noticed this issue with the children's sizes.  To get another idea of the sizing, I know that a girl/woman who is 5'4" and about 115 lbs. can fit comfortably into the size Average after they go into the dryer but that size can accommodate someone that weighs more.  75% cotton, 25% polyester, 2% spandex

If you want baby sizes go to the Babies Section on the Website and scroll down to Baby Tights.