This is sweater in classic gray. I view sweaters like this as the century version of the gray flannel suit. A good cardigan or jacket or top coat in gray makes a nice impression and I think a professional one, even in a casual crowd without being stuffy.
Layers The jacket is phenomenal, boots are awesome and will coordinate with all things casual, leather backpack color coordinates well with the boots and overall outfit. here is a great mix of color and texture.