The first day of school always goes wrong. For many students in the United States, however, this year it was even more so. It was all due to one extra school policy - they are now required to follow a new standardized dress code. According to the handbooks of all high schools in Allentown, Pennsylvania, students must wear short- or long-sleeve polo shirts and khaki   or black pants. Skinny jeans, leggings and open-toe shoes are not allowed. Allentown schools are not alone. At Edgewater High School in Florida, shirts must have collars or sleeves, and pants must not sag   and reach at least mid-thigh  . No see-through shirts or T- shirts with references to sex on them are allowed. Overall, more than half of US public schools now enforce dress codes, according to the National Center for Education Statistics. About 57 percent of schools now have a "strict dress code", up from more than 47 percent a decade earlier, USA Today said. Among young people, there are mixed emotions. Some don't mind wearing similar clothes every day while others aren't happy. Despite dress codes in many school districts, some students still come to school - even on their first day - in skirts that are too short, necklines that are too low and sagging pants that don't stay up on their hips. But there are punishments. If they are out of dress code, students can be removed from the classroom until they fix the problem. In Florida, wearing sagging pants is illegal for youths according to a state law issued in 2011. Breaking the rule results in not being able to do after-school activities, and even being forbidden to attend class. Some US schools go further and require students to wear uniforms. Many say that they simplify their jobs, saving teachers from having to punish students for wearing skirts or shorts that are too short, for instance. They can also prevent feelings of competition and envy among students. "It takes away the daily fashion show and helps level the playing field a little bit with the haves and have-nots," longtime school safety consultant Ken Trump told USA Today. Critics of uniforms say they rob students of individuality. But for some people, that's a lazy argument. "Clothing isn't the only form of self-expression. Students should know that it's what they do that counts," commented a parent named Beth Kassab in The Orlando Sentinel in Florida. According to the new standardized dress code, students in the US are allowed to wear  _  .
knee-length pants shirts without sleeves transparent T-shirts jeans sticking to skin