said, short men do look good in styles that streamline their body and help the viewer's eye travel easily up the length of their figure to their face.
To flatter a shorter body, look to eliminate unnecessary horizontal elements and thick, chunky details:
Starting at the feet, avoid shoes with needless seams or decorations on the uppers. Keeping the footwear sleek and smooth on top may not seem that important, but it helps people's attention focus on the upper body rather than the feet.
Similarly, trouser cuffs don't do anything useful for a short man. Opt for smooth hems to avoid looking chopped off at the ankles (and make sure the trousers are long enough to hide the socks completely, for the same reason).
Belts should be kept slim and simple. Avoid anything chunky or eye-catching. Big belts cut your height right in half.
A little patterning is fine, but avoid heavy horizontal striping or checks. You want most of the elements to be vertical.
By the same token, avoid unnecessary horizontal elements like extra pockets on the jacket and shirt. Your upper body look should be clean and simple.
Don't feel like you have to follow each and every one of those rules to the letter. It's not impossible for a short man to look good in a plaid shirt with a breast pocket. You just want your wardrobe to generally lean toward the slimmer, sleeker, more vertical style of clothing.
Styles for Tall Men
It should stand to reason that tall men mostly want the opposite of short men: they do well in styles that are more cluttered and that include heavier horizontal elements. That helps break up the height, reducing the impression of looming that tall men sometimes give.
Look for understated ways to break your height up without getting too aggressive about it:
Patterned shoes help draw the eye downward. That doesn't make people stare at your feet or anything -- it just gives a little downward pull to your look, which helps balance the height out some. Brogues work well, as do styles with visible seams on the uppers like cap toes and wingtips.
Outside of your most formal dress trousers, there's no reason not to have cuffs on your pants. It helps cut a bit of height off at the ankles, and the extra durability is just an added bonus.
Wider belts and larger buckles help give a solid anchor to your midsection. Like the shoes, that weights the viewer's eye down a little, keeping them from focusing on your height.
Small horizontal elements like flap pockets clutter your look up a bit, making you less of a monolithic whole. In low-formality settings, go for a busy look.
Horizontal patterns are fine, so long as they're not too bold. A really aggressive check or plaid on a big man is a lot of visual information all at once, so keep things simple to avoid overwhelming the people around you.
As with short men, there's no reason to make this your style gospel. Tall guys can do just fine in vertical stripes, within reason. All you're doing is avoiding extremes, and erring on the side of breaking your height up a little.
Styles for Heavyset Men
There's a lot of advice out there for men who want to appear slimmer. Some of it's good and some of it's not.
Try not to get hung up on the idea of "slimming down." The goal is to look good, not to look like you have a different body. Simple solids, dark colors, and a clean silhouette all go a long way toward making a broad man look big and powerful, rather than out of shape.
Jackets are the big man's friend. Wear one whenever you can! A simple dark blazer or sports jacket frames the torso and directs people's eyes up toward your face.
Keep patterning to a minimum. Thin lines on wide scales work better than closely spaced patterns. A big body has a lot of surface area, and detailed patterns can easily look overwhelming.
Large accents will help keep everything looking proportional. Avoid skinny belts, slim wristwatches, and insubstantial-looking pocket squares. You want your small details to project solidity.
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Nancy Isenberg, Andrew Burstein
Alex McCord, Simon van Kempen