Honestly, people will see you as short based on some comparison. If you're 5'10", and you're standing around 5'4" tall people, you'll be perceived as tall. Whether or not your shirt is tucked in.
If you're 5'10", and you're standing around people who are 6'4" tall, you're going to be perceived as short. Whether or not your shirt is tucked in.
Heck, if you're 6'2", but you're surrounded by NBA players, onlookers are going to think you're short. Seriously, many college and professional basketball coaches are over 6 feet. But when you see them on tv, in the midst of their players who are half a foot to a foot taller than they are, they look puny.
Things like plus or minus a half an inch in cuff width, or wearing a suit with vertical stripes, or tucking in your shirt, or etc., have an extremely modest impact (at best) on perceptions of height. The brain is far more concerned with judging relative size, and it does that by comparing against nearby people/things whose height is either known or which the brain believes it can accurately estimate. (Mind you, sometimes those estimates are incorrect. And sometimes artists, photographers, architects, etc., employ techniques to intentionally mislead the observer with regard to judging relative size. See the pic of the world's largest tourist, below, for an example of this. He may only be 5'8", but it's not his untucked shirt which makes him seem tall.)