Is there a rule of thumb as to who you are supposed to go dress shopping with? I have always planned on shopping with my mom and potentially my sisters, depending on their schedule and if they wanted to go (won't force them to if they don't want to). I had mentioned to my mom potentially inviting FMIL to see if she wanted to attend as I thought it would be nice to extend the invitation and my mom was a bit upset. It seems like she thinks this is only a mother/daughter thing. Is there some rule I am missing or is she just being a bit sensitive?
Re: XP - Dress Shopping - Any Etiquette rules?
You might end up going dress shopping several times, so taking FMIL once is not a big deal, IMO. For my first appointment I took my mom, grandma, sister, and one of my BMs who lived nearby.
Then I went once with just my sister. I went twice more with just my mom, and I ended up choosing the dress and buying it when it was just my mom.
I don't think there's any reason for your mom to get upset. Just tell her you want to include FMIL as a nice gesture, but for your other appointments it can be just you and your mom (if that's what you and she both want). Besides the appointment where you pick one out, typically you'll also have an appointment to go pick it up once it comes in, and then all the fittings, so there's lots of opportunities to include people or to have those mother-daughter moments. No big deal.