HOW TO MEASURE FOR A BINDER: STEP-BY-STEP FIT GUIDE

If you are learning how to measure for a binder, you are already doing something important. You are choosing safety and comfort over guesswork.

Chest binders can be incredibly affirming. The right one can help you feel more at home in your body and more confident in your clothes. But the wrong size can cause discomfort, restricted breathing, skin irritation and long term strain. That is why measuring properly matters.

I’m Robyn, the founder of Gaff and Go, and measuring for a binder is something our community gets wrong more often than you’d think. Not through carelessness. Usually because of urgency, dysphoria or simply not knowing where to start.

This guide will walk you through how to measure for a binder step by step, what numbers you need, and how to avoid the most common sizing mistakes.

Take your time with it. There’s no rush here.

If you’re completely new to binding, you may want to start with our Complete Guide to Trans Chest Binders.

WHY ACCURATE MEASURING MATTERS

It can be tempting to size down. A lot of people assume that smaller means flatter. In reality, that is rarely true.

A binder that is too small can dig in at the ribs, roll up at the hem and create uneven compression. It may even make your chest look less smooth because the fabric is overstretched. More importantly, it can restrict breathing and cause pain.

A binder should feel firm but not punishing. Supportive but not suffocating. If you cannot take a full breath comfortably, it is too tight. Learning how to measure for a binder properly helps you avoid all of that from the start.

WHAT YOU NEED BEFORE YOU START

You do not need anything complicated. Just a few simple things.

A soft measuring tape is ideal. The flexible kind used for sewing works best. If you do not have one, you can use a piece of string and then measure that against a ruler.

Wear a thin, non padded top or measure against bare skin if that feels comfortable for you. Avoid bulky clothing or bras that add shape, since that can distort your measurements.

Stand up straight but relaxed. Do not puff your chest out and do not hold your breath.

THE THREE KEY MEASUREMENTS

Most chest binder brands use at least two core measurements to determine your size. Some also include additional guidance depending on the style.

At Gaff and Go, for example, our Long Magic Max Binder collection uses clear chest and rib measurements to help you find the most accurate fit. We provide size charts in both centimetres and inches, because clarity matters. The goal is not to squeeze into the smallest option. It is to find the size that gives you a smooth silhouette without compromising comfort.

Here are the measurements you will usually need.

FULL CHEST MEASUREMENT

This is taken around the fullest part of your chest.

Wrap the measuring tape around your torso so it sits level all the way around. It should pass across the fullest part of your chest and straight across your back. Make sure the tape is parallel to the floor and not dipping at the back.

Keep the tape snug but not tight. It should rest against your skin without digging in. Breathe normally while measuring. Do not hold your breath or pull the tape tighter to reduce the number.

Write this number down exactly as it appears.

At Gaff and Go, this measurement is one of the key indicators in our size chart. It helps us understand how much compression the binder will need to provide across the front of your chest while still allowing you to breathe comfortably.

UNDERBUST OR RIBCAGE MEASUREMENT

Next, measure around your ribcage just beneath your chest tissue.

Place the measuring tape directly under your chest, keeping it level all the way around your body. This measurement should feel firm but never restrictive.

Your ribcage measurement is incredibly important. A binder compresses across both the chest and the ribs, so this number helps determine how the garment will sit and how secure it will feel.

With our Bond and Binder styles, we design the structure to distribute compression evenly across this area. If the rib measurement is too tight, the binder can dig in or roll. If it is too loose, you may not feel properly supported.

Write this number down clearly and keep it alongside your chest measurement when checking the size chart.

CHECKING THE SIZE CHART CAREFULLY

Once you have your measurements, compare them directly to the size chart of the specific binder you are considering.

Do not rely on your usual clothing size. Binder sizing is rarely the same as standard fashion sizing. A medium in everyday tops does not automatically mean a medium in a binder.

At Gaff and Go, we list both centimetres and inches and clearly outline the measurement ranges for each size. If your chest and rib measurements fall into different size categories, we generally recommend choosing the size that accommodates your larger measurement. This prioritises breathing and safety over extreme compression.

If you are between sizes, it is almost always safer to size up rather than down. A slightly less compressive binder will still provide flattening and structure. A binder that is too small can restrict movement and breathing, which is never worth it.

COMMON MEASURING MISTAKES

Even with good intentions, it is easy to make small mistakes that lead to the wrong size:

•  Measuring over thick clothing can add extra centimetres.

•  Holding your breath can distort your rib measurement.

•  Pulling the tape too tight can result in choosing a size that feels uncomfortable as soon as you put it on.

•  Guessing your size based on past purchases can lead to unnecessary frustration.

Another common mistake is deliberately sizing down for a flatter look. I understand that impulse. When dysphoria feels intense, the urge to compress as much as possible makes complete sense. But binders are engineered to flatten through construction and fabric, not just tightness.

At Gaff and Go, our chest binders are structured to create a smooth, balanced silhouette when worn in the correct size. Overstretching the fabric by sizing down often creates uneven compression and visible lines, rather than a cleaner result.

WHAT A BINDER SHOULD FEEL LIKE

When you put on a correctly sized binder, you will feel firm compression across your chest. That is normal. It should feel secure and supportive.

But it shouldn’t feel like a battle.

You should be able to take a full breath without strain. You should be able to lift your arms, twist gently at the waist and sit down without sharp pressure at your ribs or shoulders. The hem should lie flat rather than rolling up aggressively.

Our Bond and Binder styles are designed with comfort in mind, using soft but stable fabrics that hold their shape. When the size is correct, the compression feels evenly distributed rather than concentrated in one painful area.

If you notice tingling, numbness, persistent red marks or pain, that is a sign something is wrong. Remove the binder and reassess your size.

Pain is not part of safe binding.

EXTRA TIPS FOR FIRST TIME BINDER WEARERS

If this is your first binder, ease into it.

Wear it at home for a short period before committing to a full day out. Notice how it feels after an hour. Check your breathing. Move your arms and shoulders.

Many people aim not to exceed eight hours of wear in a day, but your body is the most important guide. If you feel breathless, sore or fatigued, take it off.

Avoid sleeping in a binder unless the product is specifically designed for that purpose. Your body needs time without compression.

Hydration and posture matter more than people realise. Standing and sitting upright helps the binder sit correctly and reduces unnecessary strain.

If you are layering your binder with other gender affirming garments, consider how everything works together. At Gaff and Go, we often suggest building your base layers thoughtfully so that nothing feels bulky or restrictive. Our guide on bras for trans women covers that layering question in more detail if it’s useful.

MEASURING IS AN ACT OF CARE

Learning how to measure for a binder is not just a technical step. It is an act of care.

It is you choosing comfort over guesswork. Safety over urgency. Support over struggle.

When you take accurate chest and rib measurements and follow the size chart carefully, you give yourself the best chance of finding a binder that feels affirming rather than overwhelming.

A binder should help you stand a little taller. It should create the silhouette you want while still allowing you to breathe fully and move freely.

At Gaff and Go, that balance between structure and softness is at the heart of how we design our chest binders. Because flattening should never come at the cost of your wellbeing.

If you want a broader look at everything we offer for trans and non-binary people, our transgender clothing and lingerie guide is a good place to start.

You deserve a fit that supports you, not one that fights your body.