Dyed wedding dress

Ask the location you got ur dress from they might know what to use or can direct you to someone who does it professionally

It's important to know exactly what fabric your dress is made of.
Natural and synthetic fabrics need different dyes for it to take
properly, and the process of dying is different as well. As Amelia
mentioned you may end up with thread that does not dye depending on what
kind of thread it is. However if you are aiming for a light pastel
color, you may not notice the difference. I think if you want to go for
it, I would recommend doing the whole dress as it may be hard to get it
even just trying to do the bottom. However if you had some natural lace or design you could try to paint the dye on with a brush exactly where you want it, this wouldn't work for anything synthetic unfortunately as that requires you boil the material with the dye. It would help to see a picture of the dress as depending on the design you could do many different things. I don't think it's a bad idea, but I do think you should be prepared for the chance of it not working out and you needing a new dress, just in case.

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Thanks for all that info! No, I have not done any alterations yet. Will do that for sure

This could be a really cool way to have a one of a kind dress.

Have you had any alterations done yet? If not when you do I would ask for some of the scraps to test how they react to different dyes. Some synthetic fabrics don't take color well, so you might end up with white thread on colored fabric or different layers might not have consistent colors.
I would also talk to your seamstress about how to rinse and wash the dress to set the dye, since you don't want to end up looking like a Smurf if your blue dress isnt colorfast because it can't be washed.

Following, I want to try this as well!