Trained for PonyXL with anime screencaps - using kohya_ss. I would mostly recommend a weight of 0.8.
For the festival outfit, you can use "harem outfit".
Since this model is trained on screencaps I also delibarately train to replicate the anime style to get the character likeness as close as possible.
If you want to apply a different style you can lower the weight (around 0.8 should be good for most).
What is Pony? It's one of the best SDXL checkpoints for anime (and more). It intrinsically understands a lot of styles, most characters and most importantly it will generate what you ask for with a much higher probability.