I bought these for my daughter to wear under her Halloween costume and under her dresses to school and it's getting colder here in Ohio. They fit her just like they should when we bought her a regular size. We are very happy with it.
Pros
I would buy them again. My grandson is almost two years old, but he is a big boy. They fit perfectly and will probably last a while.
Cons
Tights can lose their shape after being washed or worn many times.