Edit
Any strap that is worn on top of clothing or that is part of clothing, that crosses a character's chest. This does not include belts with buckles, a belt with a buckle should be tagged as chest belt.
If the strap is part of a chest harness, just use that tag alone, unless there is a separate strap not connected to the chest harness. If the strap crosses the torso diagonally, from above one shoulder to the waist, it is a shoulder strap.
If the strap is directly underneath the breasts and touching them, consider adding underbust. If it is not directly under the breasts, use belt instead.
See also
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