I knitted this summer halter for my daughter.
is the pattern. It is easily adapted to older girls, though one might not consider doing that at first look. To knit this for my daughter I only used 2.5 skeins of the Elann Esprit. Quite a bargain.
Here http://www.ravelry.com/projects/newamy/thira it is on my Ravelry page.
And a pic as well.
Thanks for looking!