Good Morning Everyone!
It appears there are a couple of pieces in the Libertine collection that are hidden on the Target site. Since the French Cream and Violet Striped Shirtdress seems to be the most sought after, though not yet available in stores, I'll offer help with it first and try to figure out the other pieces later.
If you ordered the dress on Sunday and need another size, you should be able to locate it again by going to "My Account". Select "Track Your Package", then "View Order". Once there, click on the item description and then click on the dress to the left of the screen. Both the dress and the drop down menu for size selection should appear.
Failing that, this should work for everyone *fingers crossed*
Libertine French Cream/Violet Striped Shirtdress