The ambiance is slightly steampunk, with gentlemen dressing for dinner, women being more decorative than useful, and a fine sense that decorum must be preserved.
Even Martha Wells dips into steampunk territory with her novels set in the nation of ile-Rein, particularly in her earlier Death of the Necromancer.
Sites like Dress Like a Pirate have a huge selection of items in a number of categories - gothic and steampunk in addition to authentic wear.
The dresses can be custom or you can select from categories like Marie Antoinette, Victorian, Steampunk and Medieval.
In the late 1990s, steampunk resurged, resulting in a 21st century boom with novels by Gail Carriger and Tim Powers.
Steampunk favored Victorian England, steam powered devices and answering the question what "could" have been.
Although China Mieville's novels aren't set on an alternate Earth, they just feel like steampunk to me.
Steampunk owed a nod to cyberpunk, an earlier genre that rose to prominence in the 1970s and 1980s.
The term steampunk derived from cyberpunk and was originally used slightly tongue-in-cheek.
For example, you can visit lands based on the Steampunk genre or with a pirate theme.