Looking for some “hybrid” smart trousers, here is the Chi-tight from Diesel. Kiosk78 defines them as smart. I don’t totally agree. The material used, the cut, the shape, fits the adjective “smart”. But too much details allow me considering them as casual : patches and visible buttons. That’s why I called them “hybrid”, then you could either wear them with some hi-tops or with some formal shoes.
£85 from Pilot Clothing