Age appropriate. No spandex or stretchy pants, nothing too bare. And nothing black, snake or leopard print. Osh Kosh makes very good clothes for kids that last a long time and look nice. They have clothes at good prices when they are on sale and ship for $6.
A 6-year-old girl doesn't need to look "sharp" She, and her mother, should be concerned with other things -- learning, having fun, being clean and presentable.