Gene Roddenberry had some great ideas and some not so hot.
I'd say one of his worst ideas was that a beautiful woman in TMP should be bald.
A bad costume idea, and probably Roddenberry's, was the "skant" uniform in early TNG, where a male extra would be seen walking around in a dress. If it was a good concept, the male regulars (audience representatives) would have worn it. The simple fact that that would be unacceptable should have told them something.