Thanks so much Shylaah for the information!!
Because I am a pirate who hasn't seen enough gold lately ( ie. I'm broke and on a budget ) I think I'm going to go with the quilting cotton from Spoonflower. It's totally a shot in the dark for me... I just went to order a test swatch of the print and it's $6 for 20 days or $16 for April 21... that + printing ( $16 ) + rush order fees ( $30 to Canada ) and I'm up to $62 for 1 yard.
I'm quite happy with the print and if it prints out lighter than expected, I'll just dirty it up... if it prints out a bit darker, I'll throw it out in the sun for a day or two. I'll
make it work! LOL I'll be satisfied enough with it either way for the movie ( much happier than with what I have now which is a far cry from anything close )... if I want it different in colour or fabric, I can do that with regular shipping afterwards.

I'll definitely keep your comments in mind for improving it later on. I wish I had more confidence and made this darn print sooner! Then again, there wasn't a whole lot of reference to work with...
The vest I already made is made with quilting cotton and lined with basic broadcloth and the weight is quite nice, so I'm hoping it will be similar with this one.
( obviously this vest needs a total overhaul on the back ... before I...sell it on ebay? I dont know what else to do with it now. LOL )
Everyone please pm me email addresses and I'll send you the file! I think uploading it anywhere is going to downsize it...
Happy vest-making, all!!!
EDIT: Has anyone ordered custom printed fabric before? Is it more likely to print brighter or darker?? Wondering if I should make it more or less saturated...