Pricey, but worth it.
I forgot LL Bean. Also a very good store. All of these offer high-quality clothing. It's a little pricey, but lasts well if cared for properly.
But, then, I'm an old guy of 60, so I'm out of touch, I guess. I do hope, though, that not ALL the teenaged girls start wearing modest clothing. They're so decorative, you know. [grin]