No No No leothelnss. Southern CA has the most perfect weather in the world. You get to wear all of the pieces - you just don't have to wear them bundled up on top of each other.
It true - the weather is so beautiful and sunny in the day - but the evenings tend to be quite breezy (esp. depending on your geographic location - in a canyon, near the beach etc.) I quickly got into the habit of carrying extra layers in the car to add as the weather changed. Its great - just enough chill to freshen the spirits - but not enough to shiver. The lion in you is going to love it...
Now - whether you will continue dressing 'day-time' chic is another matter. I tried to maintain it - but within a couple of months I was wearing jeans, 'little-thing' tops and thongs like the best of them.