I used Truly Victorian patterns for my jacket, skirt, and overskirt and a Burda pattern for the shirt. I just drafted up the cravat. I did a few modifications, but the patterns are very easy to use. Truly Victorian patterns can get pricey, but they are very good to work with and I recommend them to anyone.
The modifications I made were leaving the double pointed lapel on the jacket and cutting the front and back into points instead of leaving them squared. On the skirt, I made the three tiers in the back with the pleats. And on the overskirt I left off the back part of the pattern and instead made two long tails that I tied into a bow in the back. I also wore a steel boned Victorian-style corset underneath, a small petticoat, and a bustle pillow I made. As for the hat, I just covered one I bought with the same fabric that I used for the outfit.
I can always PM you more detailed directions of what I did if you want. And I have pictures in my galleries of the finished product so you can see what changes I made to the patterns.