Florentine Buckle Slip-OnFlorence Called. He's Already Wearing Them. Crafted for the man who understands that the rarest color in luxury menswear is the one nobody else dared to choose, the Florentine Buckle Slip On presents storm washed slate blue nubuck hand rubbed through multiple ageing stages by Florentine artisans until the leather carries the depth and character of a piece that already has a history. A gold keeper bar sits at the vamp like a whispered signature,