Accessories: one focal point is usually enough
A watch, a chain, a scarf, or a strong collar can each carry an outfit. Combining several high-contrast pieces near the face competes with the styling work you are already doing with hair and necklines. Choose one deliberate point of interest, then let the rest support it.
Scale and contrast
Small details disappear on heavy fabrics; oversized details can overwhelm a delicate outfit. Match the visual weight of the accessory to the weight of the clothing, and use your palette’s metals as a starting point rather than a restriction.