The jacket, titled the "Welback," has a single button at the front and a matching single button at the back and three matching buttons at the sleeve cuffs. It pairs with the "Emily" pants, which feature single button side tabs and a classic tailored leg. Or pair the jacket with the "Henrietta" skirt. I love the very tailored pencil skirt's curved waistband and tabbed sides. All pieces are available in the pictured "gravel" color. The suit is made from polyester, viscose, and elastane.
The jacket is on sale for $201 (originally $335); find it here. The pants are on sale for $95 (originally $190); find them here. And the skirt is on sale for $122.50 (originally $175); find it here.
If you want to make a complete outfit from Reiss, check out their "Maisy" cotton white fitted shirt with hook and eye front fastenings -- originally $170, on sale for $102 -- here.