Disney Princesses in Historically Accurate Costumes - by Claire Hummel - “Beauty and the Beast has always hovered hesitantly in the late 18th century (especially in the earlier concept art), so I redid Belle’s gold dress to match 1770s French court fashion.”
Note: Hummel created this updated image of Pocahontas to address criticisms of her first design. "Spunky, age-appropriate Pocahontas/Matoaka, sans feathers in the hair/European imagery/other superfluous details. This is closer to accounts and illustrations of Powhatan dress from the period, and I kinda think it's closer to the Disney design anyway. WIN/WIN."