Lost elegant black tuxedo jacket with matching bow tie near Christ Church, Oxford.

I lost my elegant black tuxedo jacket, along with a matching bow tie, while walking back from a formal event near Christ Church in Oxford on Saturday evening. The jacket is a size medium and has a subtle satin finish. I was wearing it over a white dress shirt, and I last remember having it at the event when I got up to leave. I'm really hoping to recover it as it has sentimental value.