I bought Jane a ballerina outfit a few months ago, and she LOVED it, so then I got two more, and then that was all she wore, and they are out of sync with our regular laundry because they dry flat, so she was frequently getting annoyed that her ballerina outfits weren't clean, so this weekend I broke down and bought three more in three new colors. Now that's all she'll ever wear, until the day she decides she doesn't like them anymore.
She's a little fussy about how clothes feel when she wears them, so I'm ok with having some solid go-tos.