The other real difference between 1870 & 1883 bustles..

.. is that in 1883-90, the dress was made of plush fabrics like velveteen, plushette, and sateen.  There was a depression in 1880-90 in Europe, so even women of wealth used cheap, mass produced fabrics and trims.

Regardless of the fabric or trim, the idea for all classes and status was to have an armorlike bodice with severe tailoring.

(Photo:  The 1883 day dress has copious trim with mass produced (and often garrish by today’s standards) fabrics like purple leopard spots)