It's been widely alleged that Hamas hide among civilians of Gaza and do not wear military uniforms.
The first question to ask when evaluating the validity of such claims is whether Hamas military wing does in fact have an accepted military uniform. Wikipedia shows this picture:
and this one shows their back:
The 1st link has a quote about Hamas military on one occasion wearing "brown camouflage uniforms". But that's all I can see about their adopted "uniforms."
Are there better references? Does Hamas officially have military uniform standardization?