Hannah Andersson's "It's a Playdress, It's a Daydress" is a beautifully made, super-comfy option for any little girl. My 6 year old daughter has several of these long-sleeve dresses, along with the company's Opposite-Stripe Loose Leggings to coordinate with each dress. Whenever I let her choose her own clothing, it's a "Hannah" that she chooses. We first discovered these dress/leggings outfits when my daughter was about 14 months old. The quality of these garments means that they wash amazingly well and still look brand new when your child is ready to pass them on to a sibling or younger friend. My favorite thing about these outfits is that they are beautiful and stylish (all my daughter's friends adore her Hannahs!), but they aren't the kind of outfit that make a 6 year old look like she's ready for a nightclub. These outfits are totally appropriate AND appealing to little girls! And because of the cut of the pieces, they tend to fit for a longer period of time than the average kids' outfit.
Although these outfits tend to be pricey when purchased at full price, I usually wait for the online sales, and often get the complete outfits for $35-$40. Since my daughter often gets a full year's wear out of one before she outgrows it, they are WELL worth the money!