School uniforms in developing countries: An unnecessary evil? - Hypothesis

There are charities helping families in developing countries to buy school uniforms for their children so that they can attend school. This is a good thing, right? Which part? The part about charities helping families in developing countries or the part where this is even a problem? If what I consider to be an arbitrary policy is preventing impoverished children from getting a primary education, this is a great injustice.

Link to material: http://www.thinkor.org/2012/01/school-uniforms-in-developing-countries.html