The above kilt and tartan are by venerable Italian men's tailoring company ISAIA, who have created bespoke suits for men since the 1950s. The tartan was created in 2010 for presentation at Pitti Uomo 2011, and is on record at the Scottish Register of Tartans.
There are many kilt accessories.
And of course, the most traditional accessory is the "sporran," or pouch worn in front of the kilt. These can be made of leather, hair on hide, fur, or any combination thereof...with or without tassels. Many include elaborate silver work featuring Celtic knots or designs. Sporrans, of course, come in handy since kilts have no pockets! When I wear my kilt, my wallet, keys, and cellphone go in my sporran.