There is not an opera dress code per se, but more a βsuggestedβ opera attire. The main rule to follow is to dress how you feel comfortable.
Opera Dress, February 1813
Opera Attire That is Both Stylish & Elegant
Opera Attire That is Both Stylish & Elegant
Fashion Outfits 2023 Runway Rhinestone Corset and Opera Gloves Glitt β TGC FASHION
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Queen Letizia cuts a chic silhouette in COS for the Opera Prima Film Festival - Queen Letizia Style
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NPG D47653; 'Opera Dress. Evening Costume', February 1829 - Portrait - National Portrait Gallery