Too Much Skin on Yearbook Picture?

As people get their high school yearbooks, they get amazed by the beautiful senior pictures in which they are dressed so nicely. However at one Utah high school, many female senior students were outraged after they have seen their senior photos. These students' yearbook photographs were arbitrarily edited by the school. Their photographs were edited by the school because these female students apparently violated the yearbook dress code. However, the reliability of the code came into question after many learned that the code failed to apply the policy to everyone who has violated the code. It turns out that the code was very obscure and it applied it's policy to very random students. There were even two students who wore the exact same cloths but only one of them got it's exposed skin photoshopped, whereas the other student didn't.

When I read this article, I was shocked to know that there are schools that do such things. It was not like the school prohibited their students from wearing skin exposed cloths everyday to school. It is hard for me to understand the motive behind the school's dress code policy for the yearbook pictures, which even turned out to be very ambiguous. Why suddenly install a strict dress code for the yearbook pictures? It is also unbelievable that the school board didn't expect any hostility to be aroused by the students when they arbitrarily edited the pictures without even asking the students. The school probably understands that yearbook photos are very important to seniors and to their family. Editing those pictures without any approval of the students or their family will obviously  cause opposition. There are many questions surrounding the motive behind the school's decision of creating the yearbook dress code.

Why do you think the school created such an obscure dress code?