What’s the Difference Between a Suit Jacket and a Blazer? Can a Suit Jacket be Worn as a Blazer?

What’s the difference between a suit jacket and a blazer? Can a suit jacket be worn as a blazer? Click here to learn more about this style!

Men’s jackets come in various styles such as classic jackets, sport coats, blazers, and suit jackets, but the distinctions between them can be unclear. Many people think of suit jackets and blazers interchangeably, with “suit jacket” referring to the one worn with a matching suit and “blazer” for a jacket worn with different trousers. However, is this distinction accurate?

Modern tailoring offers a diverse range of options, and menswear trends are becoming less rigid. Nonetheless, these two essential garments still have noticeable differences.

Every aspect of tailoring, from the shoulders to the inner finishing of the jacket, contributes to its style and formality level. Therefore, being able to distinguish between a suit jacket and a blazer is beneficial for selecting the appropriate attire for any occasion.

To grasp the contrast between a suit jacket and a blazer, it’s key to understand how they’re tailored. Let’s break down their basic features and highlight the main differences between the two.

What’s a Suit Jacket and a Blazer?

What’s a jacket?

A suit jacket is part of a coordinated outfit that includes trousers and sometimes a vest. Traditionally, it’s meant to be worn with matching trousers to maintain a formal appearance, though nowadays it’s common to pair it with different bottoms like jeans or chinos.

handsome jewish man in glasses looking at camera

What’s a blazer?

In contrast to a suit jacket, a blazer stands out with its distinct style. Originally designed to be worn with mismatched trousers, the classic Navy Blazer is well-known, characterized by its double-breasted design, navy colour, golden buttons, and flap pockets. There are also single-breasted versions, often associated with club blazers, typically featuring blue hues and patch pockets. Today, blazers come in various styles and colours, reflecting changing fashion trends.

What’s the Difference Between a Suit Jacket and a Blazer?


While both suit jackets and blazers come in various styles, suit jackets lean towards formality while blazers are more casual.

Suit Jacket

Suit jackets typically feature single-breasted designs with two or three buttons, or double-breasted styles with six or four buttons. Formal versions usually have welt pockets, while less formal ones have flap pockets. On lanieri.com, you can personalize your suit jacket by choosing from six different models, ranging from single-breasted with two buttons to double-breasted options.


Blazers are available in two main styles: single-breasted with two buttons or double-breasted with six buttons, often with patch pockets. At Lanieri, you can customize your blazer by selecting one of three different models based on pocket style, button stance, and lapel design, including double-breasted with peak lapels and patch pockets, single-breasted with patch pockets, or single-breasted with flap pockets.


Various techniques like “a rollino,” “a camicia,” “Neapolitan,” “Italian,” and “English” are used to tailor jacket shoulders, varying by brand, country, and tailor. Achieving universal agreement on these techniques for jackets and blazers is challenging as they often share similar structures.

Suit Jacket

Italian suit jackets typically feature “a rollino” shoulders, meticulously handcrafted with thin padding and a “rollino” to attach the sleeve to the jacket body. This technique gives the shoulder a rounded appearance, defining the jacket’s shape.


In contrast to suit jackets, blazers often have “a camicia” or shirt-like shoulders, where extra fabric is tucked under the shoulder, resulting in a softer, more natural shoulder shape.

cropped shot of businessman adjusting suit jacket in bathroom


While there’s no clear consensus on the differences between the interiors of suit jackets and blazers, modern tailoring acknowledges some distinctions.

Suit Jacket

Interfacing techniques provide softness and structure, with lightweight hair canvas extending from the roll line and shoulders to the bust. The interior lining and lapel stitching indicate quality, and suit jackets typically have a snugger fit than blazers.


Blazers, being less formal, are often unlined and unpadded, with lapels lacking edge stitching. This results in a lighter, more comfortable garment suitable for layering.


Suit Jacket

Suit jacket fabric must be sturdy and tear-resistant since it’s used for both the jacket and trousers. Additionally, it should be suitable for formal occasions, with appropriate colours, patterns, and details.


Blazer fabric can be chosen independently of trousers, allowing for lighter, less sturdy options with different patterns and details.

Style Considerations

Suit Jacket

The most formal outerwear, suitable for nearly all formal occasions. Worn with matching trousers for business meetings or with contrasting trousers for less formal settings.


A versatile option for casual and casual business settings. Less formal than a suit jacket, ideal for weekend activities with its casual yet elegant style.

Can a Suit Jacket be Worn as a Blazer?

A suit jacket and a blazer serve distinct purposes in a wardrobe, but their similarities often prompt the question: Can you use one in place of the other? To answer this, let’s first understand the key characteristics of each garment.

A suit jacket is an integral part of a formal suit ensemble, typically consisting of a jacket, trousers, and occasionally a vest. Traditionally, it’s tailored to be worn with matching trousers, creating a cohesive, formal look suitable for business meetings, weddings, or other formal occasions.

On the other hand, a blazer is a versatile piece of outerwear with its own unique style. Originally designed to be worn with mismatched trousers, blazers offer more flexibility in terms of pairing with different bottoms. They’re less formal than suit jackets, making them suitable for casual business settings, social events, or even everyday wear.

Now, can you use a suit jacket as a blazer? In theory, yes, it’s possible. However, there are some important considerations to keep in mind.

Firstly, the fabric and design of the suit jacket play a crucial role. Suit jackets are typically made from sturdier, more formal fabrics like worsted wool, often featuring subtle patterns or textures suited for formal occasions. In contrast, blazers often incorporate lighter fabrics such as cotton or linen, with bolder patterns or detailing that add a casual flair.

Secondly, the cut and tailoring of the jacket are important factors. Suit jackets are usually tailored for a closer fit, with structured shoulders and a tapered waist to create a polished silhouette. Blazers, on the other hand, may have a more relaxed fit, with softer shoulders and a looser overall construction for added comfort and ease of movement.

So, how can you make a suit jacket work as a blazer? Here are some tips:

  1. Choose the right fabric: Opt for a suit jacket made from a versatile fabric like wool blend or lightweight tweed, which can easily transition from formal to casual settings.
  2. Consider the design details: Look for suit jackets with simpler designs and fewer formal embellishments like pinstripes or satin lapels. This will help create a more casual aesthetic that aligns with the style of a blazer.
  3. Pair it wisely: When wearing a suit jacket as a blazer, pair it with more casual bottoms like chinos, jeans, or even tailored shorts for a relaxed yet polished look.
  4. Pay attention to fit: Ensure that the suit jacket fits well and doesn’t look overly formal when worn without matching trousers. Opt for a slightly looser fit compared to a traditional suit jacket for a more laid-back vibe.

Ultimately, while a suit jacket can technically be worn as a blazer, it requires careful consideration of fabric, design, and styling to pull off successfully. By following these tips, you can confidently incorporate your suit jacket into more casual ensembles while maintaining a stylish and put-together appearance.

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