Sumptuary dress laws aimed to prevent sexual mixing between faiths

Evidence

Christians were forbidden to take service in Muslim or Jewish households on any pretext whatever, and were excommunicated only for living in them (1179). Jews and Muslims might hold no position of public authority, and both must wear distinctive clothing, for fear of accidental commixtio of the sexes between them and Christians (1215). — Norman Daniel, Islam and the West, 661

Categorization

• XREF: Directly extends the published essay ‘Complaints About Immodesty Go Way Back’ — distinctive-clothing mandates here are a regulatory cousin of the dress-panic genealogy, and the commixtio-of-the-sexes fear parallels Ibn Battuta-era modesty panics.
• ADDENDUM: Supports the immodesty/dress-regulation article with a Christian legal case where dress codes were explicitly justified by sex-mixing fear, not just display morality.