Rectangle sunglasses are known for their serious demeanour, but not these Black Blue Grey Full Rim Rectangle Large (Size-58) Vincent Chase MIRAGE VC S11181-C4 Polarized Sunglasses. This pair, with its classic colouring in black with blue temples and grey lenses, has the aura of fun and seriousness put into one. They would go perfectly well for all with round-shaped faces. Kim Kardashian sure knows how to work those rectangular-shaped sunnies. You could follow her lead and don this pair with your dark-toned smart casuals any day.