Kerry Taylor probably suggested Andrew Bolton because he curated the Chanel show at the Met, however, curators don't do ids anymore unless you donate the dress first. You might try asking Claire Schaeffer who has made it her work to study Chanel couture construction and she is a member here at the VFG.
I didn't say anything earlier about your dress, although I suggested you send it to Bret because I had doubts and everyone was so thrilled for you I didn't want to come across as the curmudgeon in the crowd... However, the stitches to sew on the velvet appliques are a bit crude for couture, and the label has been resewn in, and it looks like it might have been sewn in originally in white thread, which would not have happened on a black dress. I may be wrong, but they are red flags.
Anyway, just be prepared to be told by Bolton that he won't do it, if he returns your call. You can get expert advice closer to home.