Godolhadorah — Thank you for sharing your input on the question.
Why davka “light pastel colors” and not dark colors or non-pas6el colors?
Also, you refer to the common white typically worn by kallahs as “the minhag is obviously white”. Are you thus saying that, indeed, there is a bona fide longstanding minhag in Klal Yisroel for kallahs to davka wear white to the chasuna?