One may frequently wear a bra, but for modesty wearing a camisole / vest or full slip is also an option for the top. Dresses are sometimes worn with tights.
Dresses increased dramatically to the hoopskirt and crinoline-supported styles of the 1860s; then fullness was draped and drawn to the final by any dresses had a "day" bodice with a eminent neckline Flower Girl Dresses and long sleeves, and an "evening" bodice with a crouched neckline (decollete) and very aphoristic sleeves.