With casual clothes such as jeans, a round spring ring, trigger hook or lobster claw goes around a belt loop. The watch goes in the closest front pocket. However, determining how to wear a watch chain and fob depends upon the outfit and type of attachment.
Some watch chains have belt hooks that slide over the belt, and the watch goes into a nearby pocket. A more formal Albert chain has a T-bar that goes through a vest's buttonhole, and the watch goes in the adjacent vest pocket. Traditionally, a watch goes in the pocket opposite to the dominant hand. The watch crystal faces the body for protection and ease of reading.