My favorite vegan suit is Ann Taylor's mix-and-match triacetate suit collection. I have a couple of jackets, a couple of pants, and a skirt in the black. Usually, the suit comes in black and dark brown versions. For the summer, Ann Taylor has introduced a "pelican" color triacetate suit with a with hook and eye closure on the jacket. I tried the suit on in-store; the jacket hits at the hip and the hook and eye closure fans the bottom of the jacket open a bit. Hence, I think it is perfect for a more casual, yet still business professional day. Perhaps pair it with a patterned cami or sleeveless blouse.