For nothing says casual like stripes do, an instant lifter on short of new looks days and endless possibilities to pair it anything you can find in the closet.
If you are going horizontal,opt for a size bigger.
For stripes dress look - add one pop of color with accessories as emma griffith and Jessica Szohr.
Wear it as a single piece,very few can carry off a head to toe stripes look.And pair it with solid colors.
Pair with a well cut jacket for structure if you want a cleaner look.
Have Fun.