Even Hillary Clinton, whose hair and makeup always look perfect, wears those ugly pantsuits with too long and too tight jackets. I am a recent law school graduate currently living in Michigan. I have several job interviews in Los Angeles. You can definitely be more glamorous in L.A. than the Midwest, but the best idea Is to go wherever you are interviewing ahead of time and see what the other women are wearing. It depends on the wedding and how formal it is.
Some people wear jeans.
As I said before, in L.A. almost anything goes. Ask the bride if you're not sure. But as a rule of thumb, you can wear pants almost anywhere today. Oh, by the way, the old rule that you never wear white to a wedding has gone by the wayside also. No matter how fancy a restaurant I go to, most of the men aren't even wearing jackets let alone ties, and the women look as if they just finished grocery shopping or car-pooling.