Fitting a Gambeson Under Plate Armour for Medieval Combat

A gambeson is more than a padded jacket worn for appearance. Under plate armour, it controls comfort, impact absorption, moisture, freedom of movement and the way the harness sits on the body. A well-fitted arming garment should support the armour without forcing it away from the body or creating pressure points that become painful after several bouts.

For Australian fighters, fitting also means dealing with warm training halls, long travel to events and a market where some equipment arrives from overseas with unfamiliar sizing. Whether you train in Melbourne, Sydney, Brisbane or a smaller regional club, the safest approach is to treat the gambeson, plate harness, underlayers and protective equipment as one complete system.

Why Gambeson Fit Matters

The padding beneath plate armour provides a buffer between hard metal and the body. It can reduce rubbing, spread pressure across a larger area and help hold straps, buckles and suspension points in a stable position. It should never be so thick that the armour floats loosely, nor so thin that the plates press directly into joints or bony areas.

A gambeson also affects the effective size of every piece worn over it. A breastplate that fits comfortably over a T-shirt may become restrictive over quilted padding. Arm harnesses can pinch when the elbow bends, while a gorget may become too tight when the shoulders are raised. These interactions are why trying on each item separately gives an incomplete result.

In IMCF competition, equipment must meet federation rules and pass inspection. Padding requirements, coverage and construction can vary according to the ruleset and weapon category, so a visually convincing garment may still be unsuitable for competition. Confirm the applicable regulations before commissioning custom work or modifying an existing coat.

Measure Before You Buy

Take measurements while wearing the base layer used in training, not over a bare torso. Record chest, waist, shoulder width, upper arm, forearm, biceps, thigh and torso length. For a gambeson with sleeves, measure with the arms relaxed and again with the elbows bent. The second set helps reveal whether the sleeve will pull tight when gauntlets and arm harness are added.

Pay close attention to the waist and underarm. The garment should sit close enough to prevent loose folds, but it must allow full inhalation and torso rotation. A useful test is to brace as though receiving contact, raise both arms, turn the trunk and squat. If the coat rides into the armpits or bunches beneath the belt, the cut needs attention before armour is fitted.

Australian buyers often order from overseas makers, where a “large” may reflect a European pattern rather than local expectations. Ask for a measurement chart in centimetres and compare it with your own recorded measurements. A few extra minutes with a tape measure can avoid expensive international postage, alteration fees and weeks of waiting for a replacement.

Choose The Right Construction

A gambeson for armoured combat should be made from durable outer fabric, resilient padding and secure stitching. Cotton canvas, heavy linen blends and similar hard-wearing textiles are common choices, while padding may use wool, synthetic batting or layered materials. The best option depends on the armour system, climate, washing arrangements and the rules governing the event.

Vertical or shaped quilting can help the garment follow the torso without producing broad, stiff ridges beneath the breastplate. Excessive quilting across the shoulders may lift the shoulder plates, while bulky seams can press against the collarbone. Around the elbows and armpits, reduced bulk or articulated panels usually provide better movement than a uniformly thick jacket.

Sleeve length matters. The cuff should meet the wrist protection without leaving exposed skin, yet it must not interfere with gauntlet cuffs or grip the forearm when the hand closes. A waist-length coat may work with one style of harness, while a longer skirt can improve coverage but catch on the thighs or leg armour. Test the actual configuration rather than relying on photographs.

Fit The Armour As A System

Begin with the gambeson and base protection, then add the breastplate, faulds, shoulder pieces, arm harness, leg harness and helmet. Fasten each component in the order used at training. Check whether the armour remains centred after walking, kneeling, turning and taking a controlled stance. If a plate shifts, first inspect its straps and suspension before adding more padding.

The shoulders should rise freely without the spaulders striking the helmet or sliding towards the neck. The elbows need to bend fully, and the upper arm plates should follow the limb rather than hang from the shoulder. At the hips, the faulds should overlap correctly with the skirt of the gambeson and leave enough room to sit or move into a low stance.

Heat is a practical issue in Australia. A thick gambeson that feels comfortable during a cool Victorian winter session may become exhausting in a Queensland hall during summer. Ventilation, moisture-wicking base layers and a washable outer fabric can make a meaningful difference, but do not cut away padding or coverage simply to feel cooler. Alter the garment with a qualified maker and keep competition requirements in view.

A full day of fighting can expose small fit problems that are invisible during a short fitting. Review fatigue management research alongside your equipment testing, because pressure, heat and restricted movement often become more significant as the day progresses.

Test Movement And Pressure

A proper test should be active rather than static. Walk briskly, climb stairs, squat, lunge, rotate the torso and hold a shield or weapon in the positions used during training. Practise raising the arms above shoulder height and bringing the hands together in front of the chest. The gambeson should stay in place without twisting around the body.

Look for specific warning signs: numb fingers, tingling in the arms, sharp pressure near the ribs, restricted breathing, chafing at the neck or a sleeve that pulls the elbow out of alignment. Temporary warmth is expected, especially in Australian conditions, but persistent pain indicates a fit or construction problem. Do not assume that breaking in the garment will solve a pressure point caused by a badly placed seam.

Ask a club coach, armourer or experienced training partner to observe you from the side and rear. They can see whether the breastplate lifts, whether the shoulder protection catches, or whether the back of the gambeson folds beneath the harness. Video recorded during controlled drills can also reveal movement issues that are difficult to notice while concentrating on technique.

Practical Checks Before Training

Use one short inspection before putting on the armour:

• Confirm that the collar allows full head movement
• Check that cuffs meet the wrist protection without gaps
• Make sure the waist does not ride above the belt
• Inspect stitching, quilting and closures for damage

Then perform a movement check in the complete kit:

• Raise both arms and rotate the shoulders
• Bend the elbows and close both hands
• Squat, kneel and stand without catching fabric
• Take several controlled steps with the weapon and shield

Avoid Common Fitting Mistakes

Buying an oversized gambeson is a frequent mistake. Extra room can seem attractive because it promises comfort, but loose fabric folds beneath the armour and creates pressure ridges. It may also allow plates to shift during contact. The garment should have enough ease for breathing and movement, not enough volume to behave like a blanket.

The opposite mistake is choosing a very thin jacket to make the armour feel less restrictive. Thin padding can leave hard edges and straps pressing into the body. It may also fail to provide the coverage required by competition rules. A better solution is targeted construction: adequate protection in contact zones and carefully shaped, lower-bulk areas where joints need to move.

Do not rely on belt tightening to solve a poor fit. Pulling the waist strap tighter can compress the torso, lift the lower edge of the breastplate and change the angle of the faulds. Likewise, do not punch new holes or cut material until the entire harness has been checked. A small alteration can affect suspension, coverage and the balance of adjoining plates.

A gambeson also needs care after use. Sweat and humidity can break down fibres, create odour and encourage corrosion on nearby steel. Follow the maker’s washing instructions, dry the garment completely and inspect it before the next session. Fighters travelling from Perth, Adelaide or remote areas should allow time for equipment to dry fully after a long event rather than packing damp padding into a kit bag.

Prepare For Inspection And Competition

Before an event, conduct a complete trial in the exact equipment intended for competition. Include the approved helmet, throat protection, gloves, weapons and shield. A replacement gambeson or different base layer can change the fit enough to affect mobility, so avoid treating the final week as the time for major alterations.

Keep records of your measurements, successful adjustments and any areas that require attention. This is particularly useful when ordering a second garment or dealing with a custom maker. Photographing the correctly fitted layers can help when packing for a tournament and reduce the chance of leaving out a required item during interstate travel.

Rules and interpretations can be updated, and local event procedures may include their own inspection timetable. National associations, club officials and event organisers are appropriate sources for clarification. If you need federation-level guidance about equipment or competition requirements, contact the federation before committing to a costly alteration.

A sound fitting routine also includes a realistic warm-up and recovery plan. Arrive early enough to dress without rushing, walk in the completed harness and correct problems before inspection. Keep spare base layers, repair tape, thread, fasteners and water available, while remembering that temporary repairs must never compromise the protective function of the kit.

Take your gambeson and plate harness to your next club session for a full movement assessment rather than judging the fit in front of a mirror. Have an experienced fighter or qualified armourer check the system, make measured adjustments and test it again under controlled conditions. Good preparation turns padded clothing and steel plates into a stable, mobile protective kit ready for serious medieval combat.