Seems a little irrelevant in one respect, but in another respect, the most notable and highly regarded family, the Martin Luther King family is really acknowledging to other African Americans, a hoody is at times a symbols that says "beware". This is as much of a sign as big baggy shorts, or a belt worn below the butt cheeks (personally I find utterly stupid), and even black people can identify with this. That said, if you see a figure in the dark wearing a hoody, or in an alley, lurking out behind someplace, walking into a jeweler y store or 711, any storekeeper would instantly be aware of possible robbery. You would have a totally different impression, just like George Zimmerman, than if you saw someone by a campfire in the national park, camping and wearing a hoody. This is not racial profiling, at best it is profiling of things that look suspicious, in certain settings. I will be first to admit, walking int he rain, is a good reason to have your hood up.
In MLK's time (my era), nobody ever worn hoody sweatshirts, sweatshirts were grey flannel sports sweats, with no hood or collar. We also didn't have tennis shoes other than black keds, plain ol fashioned gym tennis shoes, or plan ol fashioned deck shoes that were probably $3.99 a pair. Shorts were none existent that were big baggy gang banger shorts, Shorts were either Bermuda shorts, regular PE shorts, or maybe a pair of bluejeans cut off for the summer. This is why the idea of MLK and hoodies is a little ridiculous, since none of it existed, as well as all these gangs of today were non existent.