I read that in late 15th century robes of peerage* became formalized according to the rank of the wearer.
*those robesworn for ceremonies such as coronations
You have much better hang on the written sources from that time than I do, so I have been wondering if perhaps you know which king came up with it.
Hello! Unfortunately I have no idea which specific clothes you're referring to. The only instance I know for sure is when Margaret Beaufort set the lines for the wearing of mourning clothes according to the wearer's rank (during her son's reign). But if you mean peerage clothing more generally in the sense of sumptuary laws, we know Edward IV passed a few statues setting the rules for the wearing of some items but he was far from the first king who did that — for example, Edward III had already done that in the fourteenth century.
Maybe reading Maria Hayward's work could help you with that?
