There is no definitive answer to this question as it depends on personal preference, body type, and the specific garment being worn. Generally speaking, designs on shirts and other tops should be placed somewhere between the collar and the waist, although placement on the chest or closer to the collar can be flattering on some people. It's generally best to avoid placing designs too low on the shirt, as this can make the wearer look unbalanced or top-heavy. When in doubt, it's usually a good idea to err on the side of caution and choose a placement that's closer to the collar than the waist.
