Derby is a style of Men's

shoe characterized bythe lacing which is sewn outside of the shoes (showing visible flaps). This more noticeable lacing style makes this shoe less formal compared to the classic Oxford. Derby shoes are perfect for a smart-casual dress consisting of jeans, dress shorts, and sport coats. This version, in  the picture above,  also goes well whit  suits. 

in the picture (Shoes and belt) :  Collezione Gold, Model Derby, Toe Plain, Upper material Elaphe leather , Cover sole Leather, Internal material Calfskin,

Heel Leather  and Rubber, Shoe toecap Chisel, Construction  Blake. Belt  Collezione Gold, Bunckl e Zinc and Nickel Plated Finish , External material Elaphe leather Internal material Leather ; Construction Tubolar.