Fashion offers no greater challenge than finding what works for night without looking like you are wearing a costume.
It's hard to balance everything. It's always challenging.
Certainly a big challenge for me with evening-wear is to make it look modern and artistic and avant-garde. The very concept of a ball gown is not in itself a modern concept, and women need to wear that for a certain presence in Hollywood. I'm also aware that a starlet might go to more than one place that night so the piece could also offer, maybe not a revolution, but an evolution.