What can I do to keep from being embarrassed by falling zippers?
On the end of the zipper tab there's a hole, use a very small disposable type keyring to feed through the hole, then when you have fully zipped, clip that atop and through your button on the pants.
On the end of the zipper tab there's a hole, use a disposable type key to feed through the hole, then when you have fully zipped, clip that atop and through your button on the pants.