I modified a base pattern by Folk Wear called Gibson Girl. I would highly recommend it as the instructions were magnificent and it went together a treat. I had to modify the yoke shapes (since I was crunching I didn't alter the back one, but you should if you want to be really accurate) and add 12 pintucks down the front of the blouse. I also probably would've shortened the sleeves a bit - I just pushed them up to my elbow but I would've preferred less fabric. For the frilly bottom parts, I just used a circle shape and gathered it to fit into the sleeve cuff provided by the pattern.
For the lace parts, it was much easier to work with them after spray basting them in place with an adhesive. The gold accent lines are just a 1/8" gold ribbon glued into place with Aleene's fabric glue.
The jabot was made using this tutorial. though I would remake it in the future as the shape isn't totally accurate to the in-game model, which is rounded/a more circular shape. The fabric I used was also too heavy to get the appropriate drape.
The brooch on the jabot was 3D printed on an Elegoo Saturn 3 using Raisin Cosplay's STL.