An article in the NY Times suggests it's what they call "the flip flop factor." ...Day care workers keep children inside if they show up in flip-flops rather than sneakers or if they don’t have a coat on a chilly day. Sometimes, it was suggested, that if only one child arrived without a coat the whole class was kept inside, most likely due to supervision issues. A teacher cannot supervise students both inside and out.
It's sad to think that the actions of one kid's parents end up affecting the whole class like that - kids getting denied outside time just because one kid is inappropriately dressed for it. Have you experienced this? What do you think is a better solution for such situations?