30 seconds to auto trace in Corel... but, as always, the results are unacceptable because of the poor quality of the jpg (jaggies).
For me it was a 3-4 minute hand draw because I am too sloppy on the 1st pass and have to go back and tweak the nodes.
If you are going to be in the sign business very long you need to learn how to use vector illustration software (Corel, Illustrator, Inkscape, etc...).
Redrawing this dress (ignoring any copyright issues) is a basic task and learning to do it is worthwhile.
Looks like you are new in the biz so you will have to do alot yourself initially... later you can hire a graphics weenie so you can focus on running the biz and making sales. Hang in there!
BTW...
Inkscape is FREE opensource software. Download it and kick the tires to get your feet wet.