For a garden wedding, should I wear a formal tulle gown or a casual white maxi dress?

I’d like to be married in a garden if I meet the right man and I have two best party dresses; and feel no need in future to waste money shopping for more.

Should I wear my floor length blue tulle dress which is a formal dress, or my smart casual, white, Broderie anglaise maxi dress? Both are beautiful, but are garden or botanical garden outfits more casual?

For a garden wedding, should I wear a formal tulle gown or a casual white maxi dress?
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