Have you tried looking at on-line sporting goods stores for a picture and then copy it?
If you want the card base to be a vest shape take a piece of copy paper and fold it in half Draw the front opening and the arm hole opening on half and cut out. The sides will match .
Use a second piece of copy paper and draw the back to match the arm hole openings, shoulders and sides . Draw the neckline higher. Just look at a shirt to see what I mean about shape of the back neckline
It would probably need to be a gate fold card to accommodate the vest front.
Attach the side templates to the back template and hand cut it out as one piece and fold . Then you can add pockets etc.
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