F1 Racing Suits Measurement Guide

Sizing Guide

F1 Racing Suits Measurement Guide

Getting your measurements right is as important as the suit itself. A poorly fitted race suit can compromise thermal protection and restrict movement in the cockpit. This guide walks you through every measurement Invoke MFG requires for a perfect fit.

Why Accurate Measurements Matter

A racing suit that is too tight compresses the mid-layer thermal batting, reducing the air-gap that provides most of your fire protection. A suit that is too loose creates fabric bunching at pressure points — the knee, elbow, and shoulder — which causes discomfort over a 90-minute race and can interfere with harness routing. Invoke MFG patterns every custom suit to a driver's seated driving posture, not a standing pose, which is the only way to achieve a true cockpit fit.

Always take measurements while wearing the base layer (fireproof underwear) you plan to race in — not over street clothes and not on bare skin. This ensures the suit is sized for the correct foundation.

Tools You Need Before Measuring

Soft Tape Measure

A flexible dressmaker's tape — not a metal builder's tape. It must wrap around curved body contours without gapping.

A Second Person

Self-measurement introduces error at the back, torso, and shoulder points. A helper is essential for accurate back and torso readings.

Racing Underwear

Measure while wearing the actual FR base layer you race in. Thickness varies between garments and will affect the final fit.

Full Body Measurement Points

A B C D E F G H I

A — Neck Circumference

Base of neck, just above the collarbone


B — Chest Circumference

Fullest part of the chest, tape level all around


C — Waist Circumference

Natural waist, typically 2–3 cm above navel


D — Hip Circumference

Fullest part of hips and seat, standing straight


E — Arm Length

Shoulder point to wrist bone, arm slightly bent


F — Bicep Circumference

Around the largest part of upper arm, relaxed


G — Thigh Circumference

Around the largest part of upper thigh


H — Inseam Length

Crotch seam to ankle bone, inside of leg


I — Torso Length

Nape of neck to crotch, measured down the back

Step-by-Step Measurement Instructions

1

Neck Circumference

Stand upright and look straight ahead. Place the tape around the base of your neck, just above where the collar of a t-shirt would sit. Keep one finger between the tape and your skin — the collar must be snug but never restrictive. This measurement determines the collar height and balaclava interface zone.

2

Chest Circumference

Inhale normally and hold a normal breath — do not puff out. Wrap the tape horizontally around the fullest part of the chest, under the arms and across the shoulder blades at the back. The tape should be parallel to the floor all the way around. Do not pull tight — one finger clearance applies here too.

3

Waist Circumference

Find your natural waist — bend to the side and the crease that forms is your natural waist line. Measure there, not at the belt line. Keep the tape horizontal and relaxed. For drivers who carry weight in the midsection, this measurement directly determines the side-panel width and seam placement.

4

Hip Circumference

Measure around the fullest part of the hips and seat — typically 18–23 cm below the natural waist. Stand with feet together. This is a critical measurement for cockpit entry and exit, as most suit tearing during a rapid exit occurs at the hip seam under tension.

5

Shoulder Width

Have a helper measure from the outer edge of one shoulder (the bony point at the top of the arm) straight across the back to the matching point on the other shoulder. Do not curve the tape over the neck — keep it as a straight horizontal line. This sets the sleeve pitch and shoulder panel width.

6

Arm Length

Extend your arm forward at about 30 degrees — approximating the driving position — with the elbow very slightly bent. Measure from the outer shoulder point down to the wrist bone. A straight-arm measurement will produce a sleeve that is too short in the cockpit when the arms reach forward to the steering wheel.

7

Torso Length (Seated)

This is the most important measurement for F1 suit construction and the one most often taken incorrectly. Sit in a chair with your back straight. Have a helper measure from the nape of your neck (C7 vertebra — the bony bump when you tilt your head forward) down to the seat of the chair. This is your seated torso length, not your standing back length.

8

Inseam Length

Stand with feet shoulder-width apart. Measure from the crotch point — where the inner legs meet — down the inside of the leg to the ankle bone. This measurement ensures the lower leg opening aligns correctly with the race boot cuff and prevents gap exposure at the ankle seal.

9

Bicep & Thigh Circumference

Wrap the tape around the largest part of the upper arm (relaxed, not flexed) for the bicep. For the thigh, measure the fullest part of the upper leg, keeping the tape horizontal. Both of these affect panel comfort in the harness-loaded seating position where the suit presses against the seat edges.

Invoke MFG Standard Size Reference Chart

Size Chest (cm) Waist (cm) Hip (cm) Height (cm) Torso Seated (cm) Inseam (cm)
XS 82–86 68–72 86–90 160–168 64–67 74–77
S 87–92 73–78 91–96 168–174 67–70 77–80
M 93–98 79–84 97–102 174–180 70–73 80–83
L 99–105 85–91 103–108 179–185 73–76 83–86
XL 106–112 92–98 109–115 184–190 76–79 85–88
2XL 113–120 99–106 116–123 188–195 79–83 87–91
Custom Any measurement outside these ranges — contact Invoke MFG for a made-to-measure quote

When your measurements fall between two sizes, size up on the chest. A tighter torso is more restrictive and harder to correct than a slightly longer sleeve, which can be adjusted at the cuff.

Common Measurement Mistakes to Avoid

Measuring Over Street Clothes

Street clothes — especially jeans and thick shirts — add 1–3 cm to every circumference. All measurements for a race suit must be taken over the actual FR base layer you will wear beneath the suit.

Common Error

Using Standing Torso Length

A standing torso measurement is typically 4–7 cm longer than the seated equivalent. Using the wrong figure results in a suit that bunches at the waist and pulls at the shoulders when seated — exactly the opposite of what is needed.

Critical Error

Pulling the Tape Too Tight

Tight measurements produce a suit with zero ease. Racing suits require a small functional ease to allow the mid-layer to retain its thermal air-gap geometry. Snug but not compressed is the correct tape tension.

Common Error

Measuring Arm at Full Extension

Measuring with the arm fully straight gives a shorter reading than the arm in its natural forward-reach driving position. Always take the arm measurement with a slight forward bend at the elbow.

Common Error

Measurement Form Submission to Invoke MFG

When placing a custom order with Invoke MFG, you will be asked to submit the following measurements in centimetres. Take each measurement twice and use the average if the two readings differ by more than 0.5 cm.

Measurement Point Your Reading (cm) Notes
Neck circumference ___ Over FR balaclava liner if used
Chest circumference ___ Over FR top, normal breath
Waist circumference ___ Natural waist, not belt line
Hip circumference ___ Fullest point, feet together
Shoulder width ___ Back, point to point
Arm length ___ Shoulder to wrist, arm forward
Bicep circumference ___ Relaxed, largest point
Torso length (seated) ___ C7 to seat, sitting upright
Inseam length ___ Crotch to ankle bone
Thigh circumference ___ Largest point, standing
Height ___ Barefoot, standing straight
Weight ___ In kg, used for proportioning
Important: Invoke MFG does not accept responsibility for sizing errors resulting from self-measurements provided by the customer. If you are unsure about any measurement point, contact us before ordering — we are happy to walk you through the process or arrange a fitting session.

Frequently Asked Questions — Sizing

?

I am between two sizes on chest and waist — which size do I order?

Size up on the chest. Chest fit is the primary structural dimension of a race suit — a tighter chest restricts breathing and compresses the thermal layers. Waist fit can be adjusted with a fitted side panel or a subtle take-in, but chest panels cannot be let out.

?

Can I use measurements from a previous suit made by another brand?

Not directly. Different manufacturers apply different amounts of ease and use different block patterns. Invoke MFG builds from our own base patterns, so we require your body measurements — not garment measurements taken from another suit.

?

I have gained or lost significant weight since my last suit — do I re-measure everything?

Yes. Weight change of more than 4–5 kg typically affects chest, waist, hip, and thigh measurements simultaneously. A full set of fresh measurements is always recommended rather than estimating the change from previous figures.

?

Do I need to account for the HANS device or seat harness when measuring?

No. The HANS device sits over the suit collar, not under it — your neck and shoulder measurements are taken normally. The harness sits on top of the suit exterior. These are not factors in the body measurement stage; they are considered during the collar design and shoulder pad placement for custom orders.

Ready to Submit Your Measurements?

Order your custom Invoke MFG race suit or speak to our team about standard sizing. Every suit is built to FIA 8856-2018 standards.

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