In college we had a red shirt called the "wanker shirt" and everyday in practice someone had to wear for either playing a pile, missing goals, taking beat, doing sh#*, etc. and it was up to captains, coaches and seniors discretion, so everyone in practice uniforms and one man standing out in a red wanker shirt (over his practice gear of course). To make things worse it only gets at the end of the season and maybe once half way through the season, so dat does be stink after a few weeks. It was a motivator as everyone used to compete at a high level not to wear that, esp when the season come close to an end and it smelling rancid. From what I was told, it was a tradition started by the English players back in the early ninties and still going strong, same shirt to boot. But the nightie ting is ah different story but I understand the coach's philosophy behind it.