Quoted By:
Requesting a grown-up Lillie from pokemon (with the shown hairstyle), with a thicc mature body. Wearing a white dress that mostly fails to hide how sexy she is. Hat or no hat is fine.
Honestly, any dress is fine (can be a 'simple' sundress, can be something more fancy like she's going to a high class party like the lower right reference), and it can be lewd or 'proper', as long as it's obvious how sexy and thicc her adult body is.