Fanny is an accomplished seamstress as we can see by the wonderful outfits she creates. I like how certain aspects of the outfits appear several times in the movie, showing how one can combine different pieces to create new looks, as seen above. I often find that costumers in movies put together entirely new outfits for every scene, which seems a bit unrealistic given the amount of money, time and resources that would have gone into each item.
The dress above looks like it may have been Gothic-ly influenced:
I love how Fanny wears really different and interesting outfits throughout the film, often boasting about how she is the only one at this or that party with a particular type of ruffled collar:
Here we see the typical outfit that Keats wore during the film. Fanny is wearing a Spencer jacket, typical for the Regency time period, but different from her usual/unique clothes in other parts of the movie.
All photos are screencaps or from IMDB.