A shirt contains several precise lines before any accessory is added: collar, cuff, button placket and hem. Decide which of them should lead. When every line is emphasised at once, the outfit becomes busy; when one is supported, the shirt looks intentional.
Work with the collar
An open collar creates space for a short chain or scarf, while a fully buttoned shirt often needs no necklace at all. Large earrings can provide the focal point without crowding the neckline. Check the result from the side, because a stiff collar and heavy jewellery may overlap or push against each other.
Balance cuffs and waist
A watch or bracelet should sit comfortably beside the cuff rather than disappear underneath it. If sleeves are rolled, make both sides deliberate but not mechanically identical. A belt can connect a tucked shirt to trousers or a skirt, but the buckle should suit the scale of the buttons and not create a second centre of attention.
Consider the whole day
Sit, reach and carry your usual bag before deciding. The shirt should not pull at the placket, the strap should not crush the collar and jewellery should not catch on buttons. A successful combination keeps the clean architecture of the shirt visible while allowing natural movement.