5 Timeless Ways to Wear a Blazer

A blazer works best when its level of formality suits the rest of the outfit. Start with the invitation or workplace expectations, then choose the shirt, trousers and shoes together. These five combinations are starting points you can adapt to your wardrobe.

First, check the jacket

Try it over the layer you intend to wear. Check that the collar sits comfortably, the chest closes without unwanted pulling and your arms can move. A jacket that fits over a shirt may be too close over a substantial sweater. For a fuller fitting sequence, see Suitored’s suit-fit checklists.

1. Shirt and tailored trousers

A plain shirt and trousers are a straightforward starting point for an office or dinner where a suit is unnecessary. Choose trousers that look deliberately different from the jacket rather than an almost-matching substitute for suit trousers. Grey trousers with a navy jacket are one option; the contrast can also come from texture.

Add a tie when the setting calls for it. Check that the shirt collar and jacket lapels sit comfortably together. If the whole combination feels too formal, changing the shirt or shoes is usually easier than forcing a structured jacket into a very casual outfit.

2. Fine knitwear and trousers

A fine crew neck or turtleneck offers an alternative to a shirt. Keep enough room through the jacket’s arms and chest. If the knit bunches around the armholes, choose a thinner layer or a roomier jacket. Our knitwear guide explains how to compare shapes and weights.

3. An open-collar shirt and chinos

Use this for a relaxed setting where you still want the jacket to do some work. Try the shirt with the jacket before leaving: an unsupported collar can collapse beneath the lapels. The chinos should be comfortable at the waist and seat and sit cleanly over the chosen shoes.

Our preference is to keep the first version simple. A plain shirt makes it easier to see whether the jacket and trouser colours work together before adding a prominent pattern.

4. Jeans and a casual shirt

Denim can work with a blazer when the setting permits it. A softer, textured jacket often feels easier alongside jeans than a glossy, highly formal one. Judge the actual garments together rather than treating all denim as interchangeable.

Check the trouser shape as well as its colour. Very tight jeans and a roomy jacket can create a contrast you may or may not enjoy. Look at the whole silhouette and choose intentionally.

5. A plain T-shirt and casual trousers

This is the most relaxed option here. Start with a T-shirt neckline that sits neatly beneath the jacket and a length that works with your trousers. Check that the jacket remains comfortable when you sit. Simple trainers can suit a casual occasion; they do not make the outfit appropriate for every restaurant, office or event.

Where a blazer is the wrong answer

A tweed blazer with a black bow tie is not conventional black tie. Emily Post’s black-tie guidance specifies evening attire such as a tuxedo. Follow the invitation and clarify ambiguous wording with the host.

There is also no need to roll structured jacket sleeves to make an outfit casual. If lining, construction or working buttons make it awkward, leave them alone. Choose a different layer when the jacket cannot comfortably do the job.

Updated 30 October 2026. Originally published 16 February 2011. This article has been revised to correct formal dress advice and explain five practical blazer combinations.