Re: Does the hakama help your training?
I wear a wide Iaito obi for Aikido and wrap and secure it in a traditional way under hakama.
For judo/jiu jitsu...I wear a regular judo style obi with just a square knot that comes undone all the time. Frankly I like the fact that it comes undone. That way in competition it can't readily be used against me and when we are resetting, it gives me a break while I tie it again. So, I personally think it is advantageous to have it come undone.
In practice we usually just throw them to the side until we are done fighting and then we secure them again.