Think its there so help stop the v of the shirt itself getting ripped, a failsafe type of jobbie and not just for show. I know my son's have all "gone" there but only 5 mins to sew it back as opposed to £££s for a replacement shirt :)
Indeed, plus they always design a bespoke kit for us making it unique. I fear that if we change supplier they may only let us choose from a selection of templates.