Short height does best with slim, streamlined details. Pick narrow collars whose points aim downward over wide spread collars as broad collars make you look stouter than you really are.
It is important to have the length of the sleeve and the shirt adjusted to suit your body measurement. Nothing looks more awkward than having the sleeves that hang down too far or shirt that is too wide at the waist. A trim fitted dress shirt with the pocket and collar in the right size will stop you from looking like a flying squirrel.
This is a little optical illusion that you could use well to your advantage. Vertically-oriented patterns on dress shirts compliment short figures. Horizontal line going across will only make you look wider instead of taller. However if you are aiming to look broader, vertically striped patterns such as plaid or windowpane patterns make flattering choices. Do not go overboard with loud plaids and windowpane designs, choose more subtle tonal varieties. Dressing in dark colors from head to toe will only emphasize your skinny body frame. If you wish to avoid emphasis on your small body frame, add in a splash of white or light gray to break the whole one colored outfit. Avoid anything with over excessive stripes in varying colors and sizes as it can be a little overbearing to the eyes. Thin, simple stripes make you look elegant and taller than you actually are.
Another piece of advice for a man of short height is to remember that dress shirt is to always be kept tucked in. Shirttails that are let loose shorten your legs dramatically. Un-tucked dress shirts will cut your body in half and make you look particularly stumpy. Tucking in your dress shirt makes sure your leg line is maximized. Men with longer leg lines naturally give the illusion of being taller.
Regardless of what kind of body shape Mother Nature gave you, making the most of what you were given will make you look better and help you feel more confident.