You could try making it more practical. Fashion-plate fashion from any era is notoriously not really good for much other than standing around and walking short distances.
My favourite thing about steampunk for women is the ability to pick and choose which aspects of fashion you want to keep and which are just too frilly, restrictive, or impractical for the character/lifestyle you're imagining.
I would go with flat or nearly-flat boots rather than heels. They can still be tall boots. Something that buckles up or laces.
The skirt could have pockets added to it or that front-bustle bit (the gold flounce at the front of the waist) could be converted into a secret pocket.
The skirt and sleeves could be shortened, or the skirt could even be replaced with breeches or plus-fours.
The hat could be something smaller and less prone to wind damage. If you still want it to be fabulous and dashing it could be a little Robin Hood type cap with the big feather.
And yes, accessorize according to character.
So that's just me. If you wanted to keep the fashion-plate look and upper-class feel but take it out of the pure historical Victorian, you could mess with the fabric/pattern choices and have some non-standard accessories -- I have a vision of a cameo brooch where the carved subject is something steampunky rather than the typical portrait, flower, or animal. Maybe a rocket or a hot air balloon.