The slim fit jean has been a men's wardrobe staple for decades. Available at just about every menswear store on the planet, men's slim fit jeans allow you to ditch tailored trousers and still look respectable enough when you rock up to work.
Always go for darker shades of denim for formal occasions and wear with a slim-fit shirt and skinny belt. Black slim fit jeans work great with grey blazers and maintain the monochrome look with a white shirt and black brogues or loafers.
For a more casual weekend look, go for lighter denim washes and team up with plimsolls or boat shoes.