Let's start with colors...
spoiler: it's neutrals.
If you have brand colors, that's great! If you don't, that's also great! Either way, we're going to stick to neutrals with pops of colors. If your brand colors are white, black, and yellow, I would suggest wearing either black or white. This way you can use your images for a variety of things where colors clashing won't be an issue. Sticking to neutrals is also the best way to get a classy look. We can always have a fun second outfit or add some colorful accessories for that pop of color.