I've always known it's not the thing to do but now I wonder if I read it on here - been here a looooong time!
I only ask because my DD's MIL is apparently wearing predominantly white for their wedding and DD thinks she doesnt know it's inappropriate. DD does know but possibly from listening to me!
FWIW neither of us are particularly bothered - I dont think it's like one of those MILs you see in the DM where it looks like an actual wedding dress but I wonder if other guests will be a bit 😯