Trench Coat Guide: History, Features, and How to Choose the Right One

Quick answer

A trench coat is a belted, knee-length or longer coat traditionally made from water-resistant gabardine fabric, originally developed for military use in the early 20th century and now considered a classic wardrobe staple across both menswear and womenswear. Key identifying features include a storm flap across the shoulders, a wide collar, a self-belt with D-ring hardware, and double-breasted button closure, though single-breasted and more minimalist versions are also common today. Choosing the right trench coat comes down to fit, length, and fabric weight matched to your climate and intended use, since the style has evolved well beyond its original military and rainwear purpose.

If you searched “trench coat,” you are most likely trying to understand the coat’s defining features, choose the right style or brand, or figure out how to style and care for one properly. This guide covers all of that.

The history of the trench coat

The trench coat’s origins trace back to British military outerwear developed in the years around World War I, designed as a lighter, more practical alternative to the heavy wool greatcoats previously used by officers. Two British companies, Burberry and Aquascutum, are both widely credited with significant roles in developing and popularizing the coat’s signature water-resistant gabardine fabric and functional design during this period, and both remain closely associated with the trench coat’s heritage today.

The coat’s name reflects its association with trench warfare, where officers wore the style in the field, valuing its water resistance and practical features like the storm flap and D-ring belt, which was reportedly originally designed to carry military equipment. After the war, the trench coat transitioned into civilian fashion, becoming a widely recognized menswear and womenswear staple across the following century.

Defining features of a classic trench coat

• Storm flap: an extra layer of fabric across the shoulders and sometimes the back, originally designed to provide additional water resistance and ventilation
• Wide collar: typically designed to be worn open or fastened up higher for additional weather protection
• Self-belt with D-ring hardware: a fabric belt secured with metal D-ring buckles, historically intended to allow attachment of military equipment, now primarily a styling and fit feature
• Double-breasted button closure: traditionally featuring ten buttons in a double-breasted arrangement, though single-breasted versions have also become common
• Gun flap: a additional fabric panel, traditionally on the right shoulder, originally intended to cushion the recoil of a rifle, now largely a decorative, heritage design detail
• Epaulettes: small fabric tabs on the shoulders, originally used to secure military rank insignia or equipment
• Back vent: a slit at the back of the coat allowing greater ease of movement
• Cuff straps: small adjustable straps at the wrist, allowing the cuff to be tightened for weather protection

Trench coat fabric and materials

Gabardine

The traditional trench coat fabric, a tightly woven, water-resistant material, generally made from cotton, wool, or a blend, valued for its durability and natural water resistance without requiring a fully waterproof coating.

Cotton blends

Common in more affordable or lighter-weight trench coats, offering breathability and a more casual feel compared to traditional gabardine.

Wool and wool blends

Used in heavier, cold-weather trench coats, offering more warmth than traditional gabardine, generally suited to colder climates or as a winter-specific style.

Synthetic and technical fabrics

Modern trench coats sometimes use polyester blends or technical waterproof fabrics, prioritizing full weather resistance over the traditional gabardine’s more moderate water resistance.

Trench coat lengths and silhouettes

Length	General description	Best suited for
Knee-length	Traditional, classic length, hitting at or just above the knee	The most versatile, widely recognized trench coat length
Midi or below-knee	Slightly longer than classic length	A more modern, elongating silhouette
Full-length or maxi	Extending toward the ankle	A dramatic, fashion-forward take on the classic silhouette
Cropped	Ending above the hip	A modern, casual reinterpretation, less traditional but increasingly common

Beyond length, silhouette also varies between a traditional, structured fit and more modern oversized or relaxed cuts, both of which remain common in current trench coat offerings.

How to choose the right trench coat

1. Consider your climate and primary use. A traditional gabardine trench coat offers moderate water resistance and works well in mild, damp climates, while a wool-blend version suits colder weather, and a technical waterproof fabric suits regions with heavier, more frequent rain.
2. Choose a length that suits your height and styling preference. Classic knee-length remains the most versatile choice, while longer or cropped versions offer a more specific style statement.
3. Decide between double-breasted and single-breasted closure. Double-breasted offers the most traditional, classic look, while single-breasted versions tend to feel slightly more modern and streamlined.
4. Check the fit through the shoulders and waist. Since the trench coat is meant to be belted, some ease through the body is expected and generally intentional, but the shoulder seams should still sit properly for a good overall fit.
5. Consider color based on versatility. Classic camel, khaki, and black remain the most versatile and widely recommended trench coat colors, working across the widest range of outfits and occasions.

How to style a trench coat

Casual everyday

Pair with jeans, a simple top, and sneakers or boots for an easy, elevated casual look, using the trench coat as the outfit’s main structural element.

Work and professional settings

Layer over tailored trousers or a professional dress, keeping the belt tied or loosely knotted for a polished, put-together appearance.

Smart-casual and evening

Pair with a dress or tailored separates, adding heels and structured accessories to elevate the trench coat toward a dressier occasion.

Layering in colder weather

Use the trench coat as a mid-layer over a sweater, or reserve it for milder days, since traditional gabardine trench coats are not typically designed as a primary cold-weather coat on their own.

How to tie a trench coat belt

• Classic knot: simply tying the belt in a single knot at the front, the most traditional and universally recognized method
• Front bow: tying the belt into a loose bow for a slightly softer, more decorative look
• Back tie: tying the belt at the back of the coat rather than the front, creating a cleaner, uninterrupted look through the front of the silhouette
• Loose, untied drape: leaving the belt loosely draped through the loops without tying it, for a more relaxed, undone styling approach

Trench coat care and maintenance

• Check the specific care label, since fabric composition (cotton gabardine, wool blend, or synthetic) significantly affects proper cleaning method
• Spot clean when possible, using a damp cloth for small stains, particularly for structured gabardine coats that may lose shape with frequent full washing
• Dry clean structured or wool-blend trench coats rather than machine washing, to preserve the coat’s shape and fabric integrity
• Re-waterproof periodically if needed, particularly for coats relying on a fabric treatment for water resistance rather than a fully synthetic waterproof shell, since this treatment can wear off over time with regular use and cleaning
• Store on a proper hanger, avoiding prolonged folding, which can create creases in the structured fabric
• Address the belt and hardware separately, since D-ring buckles and other metal hardware may require occasional polishing or care distinct from the fabric itself

Common mistakes people make with trench coats

• Choosing based on brand name alone without checking fit and fabric. A trench coat’s actual construction quality and fit matter significantly more to how it performs and looks than brand recognition alone.
• Assuming all trench coats are fully waterproof. Traditional gabardine offers water resistance, not full waterproofing, and expecting complete protection in heavy, sustained rain can lead to disappointment.
• Ignoring proper sizing for layering. Since trench coats are often worn over sweaters or additional layers in cooler weather, trying it on with your typical layering pieces helps ensure a proper fit beyond just a base layer.
• Machine washing a structured or wool-blend trench coat. This can damage the fabric’s structure and shape, making a proper care label check and dry cleaning generally the safer choice for these materials.
• Never tying or belting the coat at all. While personal style varies, leaving the coat completely unbelted and open can undercut the silhouette the belt is specifically designed to create.
• Buying a color that does not suit your existing wardrobe. Since trench coats are meant to be versatile layering pieces, choosing a shade that clashes with the bulk of your existing color palette can limit how often you actually wear it.

Actionable recommendations

1. Match fabric choice to your climate, gabardine or cotton blends for mild, damp conditions, wool blends for cold weather, and technical waterproof fabric for consistently heavy rain.
2. Choose a classic, versatile color like camel, khaki, or black if you want the coat to work across the widest range of outfits.
3. Try the coat on with typical layering pieces underneath, particularly if you plan to wear it over sweaters in colder months.
4. Follow the specific care label for your coat’s fabric composition, favoring dry cleaning for structured gabardine or wool-blend versions.
5. Experiment with different belt-tying methods to find the silhouette that suits your personal style, rather than defaulting to one single approach.
6. Re-waterproof your coat periodically if it relies on a fabric treatment rather than a fully synthetic waterproof shell, particularly with regular wear and cleaning over time.

Frequently asked questions

What makes a coat a trench coat specifically? Key defining features include a storm flap across the shoulders, a wide collar, a self-belt with D-ring hardware, and traditionally a double-breasted button closure, generally made from water-resistant gabardine fabric.

Are trench coats waterproof? Traditional gabardine trench coats are water-resistant rather than fully waterproof, offering good protection in light to moderate rain but not the same complete protection as a technical waterproof shell.

What is the difference between Burberry and Aquascutum trench coats? Both British companies are credited with significant roles in developing the trench coat’s signature gabardine fabric and functional design during the early 20th century, and both remain closely associated with the coat’s heritage today, though they represent separate brands with their own specific design details and history.

What color trench coat is most versatile? Classic camel, khaki, and black are generally considered the most versatile trench coat colors, working across the widest range of outfits and occasions.

Can a trench coat be worn in winter? Traditional gabardine trench coats work best as a mid-season layering piece rather than a primary winter coat, though wool-blend versions offer more warmth and can work in colder conditions, especially when layered over a sweater.

How should a trench coat fit? Some ease through the body is expected and intentional, since the coat is meant to be belted, but the shoulder seams should still sit properly, and trying the coat on with typical layering pieces underneath helps ensure a good overall fit.

How do I clean a trench coat? Check the specific care label, since fabric composition varies significantly. Structured gabardine and wool-blend trench coats generally require dry cleaning, while some cotton or synthetic blends may allow more flexible cleaning methods.

What is the storm flap on a trench coat for? It is an extra layer of fabric across the shoulders and sometimes the back, originally designed to provide additional water resistance and ventilation, now also functioning as a signature design detail of the classic trench coat silhouette.

The bottom line

The trench coat has remained a wardrobe staple for over a century because its original military-driven functional design, the storm flap, belt, and water-resistant fabric, translates naturally into a versatile, polished piece of civilian outerwear. Choosing the right fabric weight for your climate, a length and fit that suits your style, and caring for the coat according to its specific fabric composition are what most reliably keep a trench coat looking good and performing well for years, regardless of which specific brand or exact silhouette you choose.

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