Tailor Made Shirt
Dress formally by wearing the navy blue blazer with dark colored pants (striped or non-striped) and a pair of well polished black dress shoes. Make sure to wear a tie.
Make the navy blue blazer more preppy by wearing it with khaki pants, solid bright dress shirt, and a loosely knotted tie (optional). Brown shoes or white sneakers will both work.
Impress your date on an evening out by pairing a slim navy blue blazer with a crisp dress shirt and dark jeans.