“everyone should invest in a full length mirror as well so you know what you look like from top to bottom.”
I couldn’t agree more, especially for men who leave the house with pants and jacket from two different suits; shirt tails out of their pants; pant zippers down; stained clothing; etc.
Heard this from a Rav: One remedy for men who have tznius issues is for them to take off their glasses in problem locations.
And if you have perfect vision, wear glasses for distortion.