@irinashaykDressing for vacation often means mixing casual, relaxed comfort with just the right note of fantasy. Take Irina Shayk for example. For a recent trip to Spain, Shayk continued her always-daring ways with a cheeky mix of athletic and sexy pieces that were uniquely her own.As shared on Instagram, Shayk posed for photos in a wispy transparent midi dress covered in silver zebra stripes. She strategically wore it sandwiched between a white…