Only Jewish people have that unique shape or are they the only people who still care if the trousers fall below? What was wrong with hidden suspenders? Are you afraid of being a secret suspenders guy?
You can also cut or sew loops on your shirt or undershirt and sew loops on the inside of the pants and put on an internal belt. Likewise, you can put a zipper on your shirt and pants. In that case, you should wear a belt as well so that the shirt and pants don’t move together like a children’s outfit.