How tight should a watch be?

Snug enough that it does not slide more than about three quarters of an inch along your wrist, loose enough to fit a finger underneath. It should sit just above the wrist bone, not on it.

A watch that is slightly wrong is uncomfortable all day, and the adjustment is usually free.

The test. With the watch fastened, you should be able to slip one finger between the strap and your wrist with mild resistance. Held upright, it should move a little but not slide down over the wrist bone. If it travels to your hand, it is loose; if you cannot get a finger under it, it is tight and will leave a mark and trap sweat.

Where it should sit. Just above the wrist bone, on the forearm side. Sitting directly on the bone is the most common cause of a watch feeling uncomfortable, and it also makes the case look larger than it is.

Adjusting it. Metal bracelets have removable links — most jewellers will take links out in a few minutes, often free, and you should keep the removed links. Leather straps are adjusted by hole, and if you are between holes a strap-maker or cobbler can punch one in seconds.

One sizing note for buying. On a slim wrist, case diameter matters as much as strap fit: much above 38mm will overhang the wrist and sit awkwardly however well the strap is adjusted. Case size is quoted in millimeters on virtually every listing.

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