This trend could be spotted everywhere in the Y2K era of fashion, and TV shows and books set in the Regency era have hailed in another period of empire line dresses with short, puffy sleeves.
Sense & Sensibility Patterns and Simplicity also have Regency costume designs which ... her jewellery and shawl as well as typical dresses from the period. Museums are useful for shedding light ...
One finds lots of Regency heroines in white or muted colors, with rather modest fabric patterns, and at least sometimes wearing the bonnets and cloaks that were part of women's dress in that era.