A classic little slip dress is a spring wardrobe staple. You can wear it on its own, under a blazer, over a layering top or even paired with your favorite jeans. And if you need more inspo, all you have to do is look at Jessica Alba's Instagram. While she's certainly a fan of the LBD, we couldn't help but notice how date-worthy her lacy slip dress is - and we found the exact pick online.