Definitely inappropriate And the low back cut unacceptable. Most schools have dress codes and even adults are sent home for inappropriate attire. What you wear at home off limits, but places of public have rules just like courts, no gum, must have shoes, and business like attire such as jeans and a modest type business shirt....not boobs, a mass of seen ratios. modest evening dresses
Get with the program. There are absolute year's and now's, and here's prime one.