The zipper should be face-down, so that the pull is in a place you’ll be able to grab and use when the hoodie is finished. Then, pin the zipper down.

Zipper Installation Season 13 Episode 1310 | 26m 46s | CC The Automatic Continuous Clothing Closure, commonly called the zipper, was first invented in 1917.

From stuck zippers to zippers that won't clinch, here's how to fix all the problems you'll run into with anything that zips.