My daughter just been walked around the town in bare feets (well she wore socks on) after had wee accident (totally out of character for her to have accident so I had no spare clothes and shoes!! just wrapped her around in light pram blanket like african women), nobody said anything about her feet, just remark on her "skirt"
For my son's school rules, it is very rural school, so risk of broken glass and needles is non-exist, more of muddy issues as I have seen sport fields!
