Help with flower girl dresses

My bridesmaids will be a mix and match of neural colors:


For the flower girls, I want them in white or embroidered flowers but in the same dress. I feel like that’s more cohesive. If they were different dresses, it would just look more messy, right?

Anyway, fh and I are leaning more towards this:


Its white, has flowered, and the sash is a blush/champagne. The two flower girls will be both 3 years old. One of them is my cousin’s daughter. Cousin’s sister is a CONTROL FREAK and I was just told that she is PICKY about what her niece will wear. I’m assuming she’s paying? Background on her is that she doesn’t have kids; has been trying. So on top of being a control freak, she doesn’t have kids. She prefers a tulle dress like this;

This is nice too but it’s lilac and I’m not sure this works with my neural palette. There’s not a lot I’ve found. The ones with tulle are $100+, whereas the first one is on sale for $35 and this second is $65. Both found on Dillard’s. My mom said to have two girls wear different dresses but that’s too much of a mess. The bridesmaids are already mixing/ matching. My mom is wearing blush, FH mom is wearing mauve.
Thoughts and help?