I have a Bujin poly/cotton hakama and absolutely love it. Fit is very dependent on the measurements you provide Bujin. And as already mentioned, the "Aiki" koshita is nice (although I have the traditional koshita on my hakama).
The pleats have held very well. Of important note though, is to thoroughly soak the hakama before wearing it. My hakama had a lot of extra dye (black) on it that I didn't notice before putting it on. After removing the hakama for the first time, my dogi looked as though someone had sprinkled charcoal all over it. A few good tub soakings has eliminated this.