Before saying anything else, I want to state that I think men and women on their own time (not at a job) should be able to dress however they please.
But there are so many people here defending the right of women to wear revealing clothing. That's fine, but how often do we consider the cultural norms (in the Western world) that women's bodies be uncovered, pushed up in all the right places and put out there for general sexual (thought) consumption? It is no accident that women's clothing is more revealing, that women's formal wear tends to be strapless and plunging, even that women's shoes tend to look a certain way.
So we are quick to criticize the idea that women should be expected to cover up, but we aren't so quick to criticize that spaghetti straps, short-shorts, strapless, figure emphasizing, leggings and other fashions are marketed almost exclusively to women. That, IMO, is just as sexist as the opposite of expecting women to cover up.
I think that I am with Rachy. Not only is thinking about sex all the time exhausting, but so is looking for reasons to be offended. Yes, the woman who wrote the piece has misplaced concern and should expect her son's to take responsibility for their own focus and their own thoughts. But I don't feel that workplace or school dress codes (not that Universities have one) are unfair in most cases, as they generally do expect the same things for men and women (as far as covered is concerned, men are expected to wear suits and ties, which is far more restrictive than women's dress codes).