A three-piece suit refers to a set of clothing consisting of a suit jacket, a waistcoat, and trousers.
So, what are the rules and etiquette for wearing a three-piece suit? Let's take a look together today~
Why wear a three-piece suit
A three-piece suit not only represents fashionable dressing but also represents an identification with the culture of clothing and a consideration of the sense of ceremony in life.
Compared to the two-piece set, the three-piece outfit with an additional vest is more versatile. After taking off the coat, the fitted vest underneath will perfectly accentuate your figure. Moreover, its warmth retention is better than the two-piece set.
Which occasions to wear the three-piece outfit
This practical and easy-to-wear suit three-piece set can shine in various occasions~
- Wedding
First of all, the three-piece outfit is the best choice for the groom at the wedding. In such a solemn and formal occasion, the three-piece outfit can perfectly demonstrate your attention to the wedding and your respect for the bride and all the guests.
In terms of the color of the suit, you can choose dark gray or black. The colors of the bow tie, square scarf, and corsage can be coordinated with the color of the bouquet to embellish it, which is both festive and not losing its solemnity.
Of course, the best man can also wear the three-piece outfit, but to avoid taking the spotlight away, you can choose a safer light gray color and omit overly decorative accessories.
- Business occasions
Formal business occasions cannot do without the suit three-piece set. For example, attending important meetings, business negotiations, and formal conversations with leaders, it can help you shape a professional, capable, mature, and stable professional image.
At this time, you can choose a darker and more serious black color and a fitted shape. A loose shape would seem too casual and relaxed.
Avoid using overly contrasting accessories. You can choose a tie of the same color as the suit or a square scarf of a color similar to the shirt, and pair it with black or brown leather shoes. This not only shows rigor but also has an extremely high elegance index~
- Casual Occasions
Of course, the versatile three-piece suit is not only suitable for formal occasions, but can also be worn during casual activities such as shopping and gatherings.
For example, you can choose a brighter blue color scheme and lively large patterns to instantly break the tension of the overall look. At the same time, by pairing with sporty white loafers and discarding heavy dark leather shoes, you can appear both relaxed and energetic.
Of course, in casual occasions, you can also try different color combinations to create a mixed three-piece suit, creating a fashionable contrast of different colors, and relaxing the overall style and atmosphere.

What etiquette should be noted
After understanding the occasions and matching methods, gentlemen should also pay special attention to the dressing etiquette of the three-piece suit. Otherwise, it will look out of place and not be gentlemanly~
Firstly, the suit must fit well. Either too loose or too tight will affect the overall sense of the outfit. It is recommended to choose custom-made suits~
The waistcoat can be close-fitting, but when fastening the buttons, it should not appear too tight. The hem should just cover the belt, and there should be no shirt showing between the waistcoat and the pants.
Secondly, there are also specific rules for the buttoning method.
Unbutton all the buttons of the suit jacket and the last button of the waistcoat. This not only highlights your expertise and professionalism, but also has a very practical benefit: when you sit down, unbuttoned buttons can prevent the skirt of the suit from wrinkling or bulging, and also reduce the sense of restriction.
Finally, in terms of details, the embellishment of accessories can better reflect your taste and refinement.
The pocket watch should be worn on the jacket, while the color of the tie determines whether the overall outfit style is formal or lively.




















