Hook vs Loop: Which Side Goes on the Patch?

https://s3.us-east-2.amazonaws.com/sewwhat-embroidered-patches-s3-2611/custom-patch-guides/uncategorized/collecting-patches-storage-and-display-tips.html

If you have ever ordered custom velcro patches and then stood in front of a jacket wondering why the patch won't stick, you have met the hook-and-loop question