Simple and clean-cut is the practical option for most, but taking simple and adding a quaint flare that sets you aside from the basic white Vans slip-ons is easier attained than most think. Calvin Klein, known for its soft tones and simplicity, took the universal slip-on and added its own "flare." Designers such as CK and an even more affordable vendor, ASOS, has transformed this casual shoe into a versatile option to tone down your silk dress or even dress up your sweats.