Make one colour easy to see
A navy jumper with black trousers is a simple place to begin. The colours need not be dramatically different, but seeing them together in daylight helps. Some navy fabric looks nearly black indoors and noticeably blue outside; that is a reason to check, not a reason to reject it.
Choose one larger area of each colour before adding more pieces. A black coat, navy trousers, navy scarf and several slightly different dark blues can be harder to assess than a two-piece starting point.
Let texture separate the pieces
A soft knit above smooth trousers gives the eye a difference even when the colours are close. Denim, brushed wool and a clean cotton shirt each create another kind of surface. You do not need contrasting fabrics everywhere; one clear change is often enough.
If the combination feels flat, try a lighter shirt collar, a visible cuff or a small metal accessory. These are optional details, not requirements for making dark colours work. Removing a busy scarf can also make the combination feel more deliberate.
Finish with the outer layer
Put on your coat and pick up your usual bag. Black shoes and a black bag can connect the lower part of the outfit, while navy remains the larger colour above. Alternatively, let the shoes introduce a different neutral you already wear.
When buying a supposed match, compare the items physically if possible. Matching two separate navy garments is a different job from intentionally combining navy with black. Keep the receipt and retailer conditions in mind while deciding at home.
