I had this come up several months ago...not a quilt but a wedding dress. A friend's dtr is getting married and asked if I would make her dress. The dtr had seen a and tried on a gorgeous dress and her mom was trying to save money. I told her I wouldn't make an exact duplicate of the dress, I could do something similar but it really wasn't going to be any cheaper as it was like 6 layer skirt and lace overlay with beading. I told her IF she could find the fabric it was still going to cost her big $$ and as her dtr is a bit of a bridezilla (I didn't say THAT) and she loved the dress she tried on, I didn't think she'd be happy with anything I did. Long winded way of saying that unless I'm making a dress from a pattern, I won't make an exact duplicate of anything. And even then I usually tweak it a bit.