This is William Arthur typeface T-497, used on a wedding invitation. Can anyone identify the font name or something very similar?

Most probably another custom job by Hallmark and exclusive for William Arthur. You may like the work of Stephen Rapp: Memoir, Montague Script, Hiatus...
Another designer with some beautiful, yet personal-looking, scripts is Laura Worthington. Her Alana is similar, and has many alternates allowing a choice of fancy-to-plain script looks.
Another prolific designer, who used to work for Hallmark is Rob Leuschke.
- Mike Yanega
Captured from web.archive.org on 10 Apr 2015. view this capture
Thank you!