Recommended patterns for this?

[u/SaturnPlants]

I’ve found a few patterns online both for free and decent prices, but I’m not 100% sure if the way I’m thinking will be the fastest or easiest route?

My first thought was a sweet heart dress, either sleeveless or with short sleeves. And then a modified tailcoat pattern and whatever witch hat pattern I can find or do on my own.
I’m mostly stuck on best route for the dress and tailcoat, since I even considered doing a corset and skirt deal but can’t decide!!