Front/chest plate
The top of your plate should be at the level of your suprasternal notch aka jugular notch. If you follow your sternum towards your head, the soft spot you reach at the top of it is the suprasternal notch. Your plate should ride at least level with the top of your sternum while standing.
The importance of positioning the plate at the top of the SN Notch is that you have a bundle of large blood vessels which rest on top of your heart and lie behind the manubrium (the uppermost portion of your sternum), most notably the aortic arch. The aortic arch receives blood from your left ventricle and will have the highest velocity of all the blood in you systemic circulatory system. Get hit here and you will be done. So, make sure your plate is riding higher, rather than lower because protecting your aortic arch is much more important than protecting your guts.
Also, as you can clearly see with the image below, a smaller plate allows for more comfort and mobility to the shooter will not necessarily mean you will leave immediately incapacitating areas unprotected -large plates will only cover a little more of your peripheral lung tissue and guts.
Red is your heart and related blood vessels
Dark Grey/Yellow is a properly positioned plate
The sternum and clavicle are white with black outline
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