Pony LoRA used to generate Semiramis from Fate/Apocrypha and Fate/Grand Order.
I recommand a weight between 0.7 and 1; all of the example images are generated with a LoRA weight of 1.
To generate Semiramis with her dress, you need to add semiramis (fate), black dress, fur trim, bridal gauntlets to your prompt, and you're pretty much sure to have the right costume 99% of the time.
If you use only the semiramis (fate) keywords, then you can change her clothing as much as you want, but you will have pretty low chances to have the model generate the official costume of Semiramis without being prompted to do so.