More to explore:
Note 1890s equestrian fashion. Note the top hat. Some of the fashions of steampunk seem inspired by the slimline darker colored habits of the 1880s with their high buttoned bodices and trousers rather than petticoats, and then to the 1890s equestiran with longer jackets and "leg of mutton sleeves"
1895 women riding habit - Google Search
Victorian Riding Outfit!!! Love the Top Hat!!!