Anyway, the method I used turned out pretty well with a few sizing and fastening tweaks so I thought I'd share with you what I did.
You'll be needing:
+sequin fabric (in my case I used an old sequin top)
+a small zip (approximately the length of your chest to belly button)
+a sewing machine (or if you're fab at hand-sewing that'll do)
+and some newspaper or tracing paper
To make my pattern, I used an Elizabethan corset pattern found here: http://www.elizabethancostume.net/custompat/index.html the link provides you with a generator which step-by-step shows you how to draw out your corset pattern with the correct measurements according to your body shape.
One adjustment I made to the pattern was changing the diagonal joining between point D and B (step 9 of tutorial) to a straight line (therefore extending point D by a few inches). This was so I could use a zip fastening rather than a complicated corset style fastening.
Placing my newspaper cut (green points) pattern onto my goooorgeous floral sequin fabric with my colour co-ordinating pins!
Pattern cut out, turned at the edges and then hemmed ready for zip-age.
Zip in place and paired up with its perfect mate - some vintage Levi's.
Thank you for reading & I would absolutely love to hear about any similar projects you've carried out yourself.