The Overshirt: What It Is and How to Wear It

The overshirt is a relatively recent name for a relatively old garment. Work shirts, chore shirts, CPO shirts — they've existed in various forms for decades, worn by men who needed something heavier than a shirt but less formal than a jacket. The modern overshirt is essentially the same thing: a shirt construction in heavier fabric, cut to be worn as an outer layer.

Despite that simple description, the overshirt generates more confusion than it probably should. This guide covers what it is, how it differs from similar garments, and how to use it practically across different situations and seasons.

What Makes an Overshirt an Overshirt

The key distinction is weight and intended function. A shirt is designed to be worn against the skin or over a base layer; an overshirt is made in heavier fabric — cotton flannel, linen, chambray, canvas — and designed to be worn over other garments as a light outer piece.

Most overshirts share certain features: a heavier fabric weight (typically 200gsm or above), chest pockets, a slightly longer body than a standard shirt, and more structure in the collar. The construction tends to be more utilitarian — this is a working garment's shape, adapted for everyday modern dressing.

Overshirt vs Shirt Jacket

The terms are sometimes used interchangeably, but the distinction is worth keeping. A shirt jacket — sometimes called a shacket — is generally heavier, with more structured shoulder and chest construction, and is intended primarily as outerwear. An overshirt is lighter and more flexible: it can function as an outer layer on mild days and still works under a coat or jacket on colder ones. The overshirt is the more versatile of the two.

Fabric Weight and Season

Cotton Flannel

Brushed cotton flannel is the most common overshirt fabric. A well-made cotton flannel overshirt — approximately 220–280gsm — is warm enough to wear alone through autumn and early winter on mild UK days, and light enough to layer under a wool coat when temperatures drop further. The brushed surface adds texture and softness that plain cotton doesn't have.

The Burrows & Hare Two Pocket Cotton Flannel Overshirt — available in Mustard, Green and Navy — sits at this weight. It pairs directly with jeans and cord trousers and works well worn open over a mock turtleneck or crew neck sweater through October to February.

Linen

Linen overshirts work through spring and summer — lighter than flannel, breathable, and suited to warmer temperatures. Worn open over a t-shirt or linen shirt, they add a layering option for unpredictable British summer days without adding noticeable warmth. The texture of linen in an overshirt construction also makes them more considered than a plain cotton shirt worn open.

Plain Cotton

Cotton overshirts in mid-weight poplin or canvas sit between flannel and linen in terms of seasonal versatility. They work through spring and early autumn as an outer layer and machine-wash easily. The Iffley Overshirt in cotton, made in Portugal, has a cleaner cut suited to smarter occasions alongside tailored trousers or chinos.

How to Wear an Overshirt

Worn Closed as an Outer Layer

The most natural application: buttoned up over a plain t-shirt or base layer, with jeans or cord trousers. The overshirt replaces a jacket on days where the temperature doesn't require something heavier. This works best with a cotton flannel or heavier cotton construction and is the garment at its most utilitarian.

Open Over a Knit

An overshirt worn open over a crew neck sweater or mock turtleneck adds visual layering and warmth without adding bulk. The overshirt sits across the shoulders and chest while the knit fills the neckline naturally. Useful through October and November when the weather is variable and a jacket would be too much.

Closed Under a Coat

Worn buttoned under a wool or waxed cotton coat, an overshirt adds an additional thermal layer without the shoulder bulk that a gilet or padded liner would create. The shirt construction sits flat against the body under the coat. This works particularly well with a cotton flannel overshirt under a longer wool overcoat on cold days.

As a Smarter Layer

An overshirt in a clean, plain cotton cut — rather than a bold check flannel — can read as a slightly more considered layering piece alongside tailored trousers and leather shoes. Leave it open or half-buttoned and treat it as an alternative to a blazer at the casual end of smart-casual dressing.

Getting the Fit Right

An overshirt is a relaxed garment and should fit accordingly. The shoulder seam should sit at or slightly beyond the natural shoulder point — narrower than this and the garment looks fitted in a way that undermines its utility. The body should have enough room through the chest and waist to sit comfortably over a mid-weight knit without pulling across the back. The length should fall at or below the hip.

If you find overshirts consistently too long or narrow in the body, look for styles described as "relaxed fit" or check the product measurements against a shirt you know fits you well.

The Full Range

For overshirts in cotton flannel, linen and plain cotton, see the Burrows & Hare overshirts collection. For lighter shirt options in the same fabrics, see the men's shirts range. For similar layering pieces in knit construction — crew necks, mock turtlenecks, V-neck cardigans — the knitwear collection covers the full range of weights and styles.