Would this one work? It comes in two colors:
http://www.serenecomfort.com/Miss-Elaine-Zip-Front-Long-Brushed-Back-Satin-Robe-in-Royalty-P9913C199.aspx
http://www.serenecomfort.com/Miss-Elaine-Zip-Front-Long-Brushed-Back-Satin-Robe-in-Empress-P9948C199.aspx
Cuddledown:
https://www.cuddledown.com/itemdy00.aspx?ID=102,3314&T1=Z8273+510+22
https://www.cuddledown.com/itemdy00.aspx?ID=102,3314&T1=Z8781+830+26