Dilemma for the theme!

I don't have a theme or a color scheme. But I don't think that a rustic theme would clash with your dress!

When you say rustic do you mean like rugged in the country rustic or more of a rustic aesthetic in a controlled environment (restaurant, event hall, lodge etc.). I think the dress is beautiful and won't mess with a rustic theme, but if you're on a muddy farm or more natural setting it may prove a bit inefficient.

If you really feel your dress will clash with a rustic theme, then I'd suggest doing a modified theme such as rustic chic. You can keep the rustic feel but add some softer fairytale-like details to compliment your dress.

Here's what I mean by rustic chic:

https://www.weddingchicks.com/blog/rustic-chic-meets-vintage-barn-wedding-with-a-french-twist-l-10088-l-43.html

In this day & age u don't have to pick 1 or the other.. infuse the looks together.. Rustic Fairytale is very romantic.. Maybe HAPPILY EVER AFTER.. U could use a rustic venue then decorate adding lots of twinkle lights & flowers & candles..
Heres some pics I think show how it can blend together beautifully.

A woodland theme would look amazing! Natural elements with romantic touches and soft colors would be so pretty with your dress.

Woodland Wedding

You could easily do a rustic theme with that dress. I act6tried that one on. It's pretty!

Your dress is beautiful! I love the illusion back so much! I don't think it's too "fairy tale", but if you want to go that route, there is actually a lot of stuff on Pintrest with ideas on how to incorporate the rustic and fairy tale styles together! There's a lot of burlap with lace options that would be super cute! You can also look at "woodland wedding" for some more ideas!