FOOTBALL shirts are walking advertising billboards: sponsors on the front, advertisers on the back and virtue signalling on the arms. There is no limit to how commercial the humble shirt can become, with clubs issuing three kits a season to maximise the profitability from their supporters. Once, we just wore a scarf to signify our allegiance, but now, the die-hards don the tinderbox fabric to demonstrate their undying loyalty to their club. Actually, they look dreadful on most supporters, many of whom squeeze into their XXL kit and wear them at all times – at a game, at home, down the pub and even for a night out in town. Admittedly, they solve a “what to wear” problem, but really, football shirts should be…