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I wear all size watches a little loose. I hate tight watches. I wear them so I can just barely stick my index finger through the gap.
You don't want it "too tight" because then the links will indent your skin and the watch will look a little weird when it's so tight because then it won't move on your wrist. I'd suggest letting it be just slightly loose to give a nice casual and effortless look. I love the two-tone MK chronograph, it's great with casual wear and can look a bit dressed up too if you want it to be =)