Lower Layer: Longer cut T-shirts and tanks, hanging loose or tucked in. But nothing exactly the same length as the jacket! It looks forced and awkward.
Top Layer Option: A casual shawl provides extra warmth an makes the prim-and-proper cut of the blazer feel a little less formal. Bonus!
Styling Tip: A-line skirts and fit-and-flare dresses are just the right silhouette to balance a Coco Chanel jacket's square proportions. Pants should be exaggerated shape as well, so go for legging-like skinny or wide leg.