»sumptuary

Sumptuary laws addressed the "... concern was that money spent on frivolous display would be better spent on the state of more important things, such as horses, critical to a society always in peril of the neighbors.
The other concern was that letting anyone wear just anything must lead inexorably to moral decline. If you couldn't tell a milkmaid from a countess at a glance, the very fabric of society might unravel."
Black's Law Dictionary (1999, Sixth Edition, p. 1436) defines them as "Laws made for the purpose of restraining luxury or extravagance, particularly against inordinate expenditures in the matter of apparel, food, furniture, etc."