I wouldn’t wear white or cream to wedding as I know how ridiculously precious - and, frankly, insecure - some people are about it.
But I wouldn’t have even noticed if someone had worn white to my wedding. Probably someone did.
Why would you care? It’s your day, everyone’s there to celebrate your wedding, to the love of your life - and you’re focused on what some guest is wearing?? How does it even occur to you to care?
Have a bit of confidence in yourself - honestly there is something unbearably cringy about thinking about being outshone on your wedding day by a guest. It’s even more cringey to need to outshine anyone, and be all <sad face> because someone is wearing white.
Focus on what actually matters about the event and the day.