Stuck trying to find a wedding dress and suit

Hi everyone! I've been trying to find a wedding dress the sustainable way, by shopping on Vinted. Unfortunately it's been really hard. I already bought 2 dresses, and both of them were disappointing in real life and look bad on me. I know you need to have the dress tailored, but these are just not it. Also, many people don't reply when I ask for measurements or extra pictures.

I'm looking for a white dress that's nice enough to be a wedding dress, but doesn't scream wedding, so I can also use it for other formal events in the future.

I would prefer natural fabrics, as it will be summer, but it is not a must. I just don't know what brands to look for that make wedding dresses in natural fabrics. I checked cotton white summer dresses, but they were looking boring and mostly see-through.

We haven't even started to look for a suit yet, my partner wants to just go to Amsterdam and go shopping there instead of on Vinted. I think linnen would be good but I'm afraid we wouldn't easily find it in stores.

Looking through Vinted is taking up all of my time these days.

Does anyone have advice?

Are there sustainable brands with a shop in the Netherlands where we can try suits and dresses on?