Clothing advice for tweens?

So, we have established that we don’t want a “sweet and sassy” girl, but does anyone have any suggestions for better tween fashion options? My oldest daughter is 9, but quite tall, so she wears a size 10 or 12. For school she can wear khakis or jeans and a cute top, it’s still pretty easy to shop at Old Navy or Land’s End for her casual clothes, but she needs some outfits or dresses for mass and other dressier times. This summer, she wore little cotton Lilly Pulitzer shifts (bought super on sale from Rue LaLa in the spring, for about $15 each), and as she grew she added leggings to keep them from being too, too short.  The Land’s End kid dresses come in her size but they look too young (and therefore a bit nerdy), but the dresses in the department store are too trendy.

Where do you have good luck shopping, and what are your girls wearing for fall and holiday this year?  I like for my girls to have one or two “church” outfits each season, which also work anytime we want to be more put together during the day, and then also at least one dressier dress for the Christmas season — up until now, I have always been able to find gorgeous Christmas dresses on sale by shopping off season, usually in June, but I struck out this year.