A strap changes more than the color around a dial. Its width, thickness and texture affect the overall balance of the watch.
Begin with compatibility
Check the exact lug width and attachment system. Some watches use proprietary fittings; a standard strap will not necessarily fit. Buckle width can also differ from the width at the case.
Think about everyday use
Consider moisture, heat and the type of activity in your routine. Follow the watch and strap manufacturers’ care instructions, rather than assuming that every material tolerates water in the same way.
A subdued tone can draw attention to the dial. A textured strap can soften a formal case. Use these as starting points, then choose the combination you enjoy wearing.