mil help (again)

Hey everyone. I recently posted a question regarding what to do about my MIL. I’m really struggling. I’m the type of person who just does NOT want to cause any tension with anyone. So ’m having an issue standing up for myself in this situation. I’ll give some background: basically my MIL and SILs are having 3 outfits changes during my wedding. My MIL also wants me to change once at least (I’m sure she would like more). I do not want to. Especially with everything going on this year, how difficult and emotional it has been trying to plan and replan a wedding 3 times now because of COVID, I just really want to enjoy my day in the outfit that I’ve chosen that my parents have so graciously bought for me. But she has mentioned me changing three times now even though I have said no each time. The first two times I said no and then today she spoke to my mom on the side during a vendor meeting and told her that basically I should do some things “to please the other side(in laws) ” which is apparently the advice she gives her own daughter too. The time before this she said that I’m representing their family now so while it’s “my choice, I should think about the fact that I’m representing their family post wedding”


This in my opinion is such backward and old fashioned thinking. I just absolutely HATE that she keeps bringing it up to me or my family. She has already taken a look at my outfit after insisting she has to see it, and has made snide comments about it. It’s just SO frustrating and honestly hurtful.
My question is : am I doing the right thing or wrong thing by deciding not to change? I would much rather spend the time with my guests and speak to them all including the ones coming from “their side” to me that is so much more important and special than making outfit changes.
Please advise, I’m at a loss completely
Thanks in advance!