It's a myth that all you have to do is throw on a suit to look your best. In reality, the cut, design, and detailing of a suit have very different effects depending on the wearer. For example, if the wearer has narrow shoulders and wants to appear more athletic and toned, a wide or "peak" lapel is the answer. These lapels draw the eye away from the centre of the body, creating a sense of width and strength. If a client is tall and slim we recommend a double-breasted jacket. The jackets imply their own shape, adding the sense of musculature, while a loosely fitted jacket completes the look.
If on the other hand, you wish to appear slimmer, there are a few options. One is to use slanted pockets rather than straight, as this emphasises curvature and more equally distributes mass. If a larger wearer wants pinstripes, we'd advise that these are narrow and faint. That way they can draw the eye inwards, making the wearer seem taller and again visually be distributing mass. Finally, we'd suggest a waistcoat, which can cover problem areas while looking dashing.
Of course, it's not always about changing perceptions - some people just want to stand out. For them, we suggest contrasting double button holes on the lapels and sleeves. In fact, for the confidently stylish, you can even match these to the lining of the suit jacket.
There are as many ways to wear a suit as there are people to wear them, but make no mistake: you'll only look your best when you take the best advice.