How to Measure Your Favorite T-Shirt Before Buying Online

The size on the tag only tells part of the story. Two tees marked large can fit differently through the chest, shoulders, and body. When you’re shopping online, a shirt you already own is a useful starting point.

Grab your favorite tee, a measuring tape, and a flat surface. A few measurements can make choosing your next daily rotation a lot easier. Higher standards, less guesswork.

Start with a shirt whose fit you actually like

Choose a tee you wear comfortably on its own. Use one that has already been washed according to its label, so you’re comparing against its familiar everyday fit. Empty the pocket, if it has one, and lay the shirt flat without pulling the fabric.

Smooth out folds with your hands. Don’t stretch the shirt to make the numbers look better; the goal is to record how it sits naturally.

Measure chest width across the front

With the shirt facing up, measure straight across from one underarm to the other. Keep the tape level and record the flat width. A flat width of 22 inches corresponds to approximately 44 inches around the garment, but use that conversion only when the size guide calls for garment circumference.

Check the retailer’s measurement diagram first. Some guides measure at a specified distance below the armhole. Match their method when comparing.

Measure body length from the right starting point

Many garment guides measure length from the highest shoulder point beside the collar down to the hem. Others use a different starting point. Follow the product’s diagram rather than assuming all length measurements mean the same thing.

Write down your preferred tee’s length and where the hem falls when you wear it. If you want more coverage, compare that measurement with the next size; don’t assume sizing up changes only the width.

Check whether the chart measures you or the garment

A body-size chart lists the wearer’s measurements. A garment-size chart lists the finished shirt’s measurements. They aren’t interchangeable because the garment needs room around your body.

If the chart asks for your chest circumference, measure around your body as directed. If it lists flat shirt width, compare it with your laid-flat tee. Keep inches and centimeters consistent throughout.

Choose the silhouette before choosing the size

For a close fit, compare with a tee you already like wearing that way. For a roomier look, use a roomier reference shirt. That’s more reliable than automatically going up one size, particularly when a product already has a relaxed cut.

For the Eyes Low Pocket T-shirt, check the current product page and its size guide before ordering. Compare the listed measurements with your notes, and look at the available product photos for how the shirt is shaped.

A real example: comparing medium and large

The current Eyes Low Pocket T-shirt size guide lists medium at 20 ¼ inches wide and 28 inches long, and large at 22 inches wide and 29 ¼ inches long. These are shirt measurements, not your chest circumference.

  • If your reference tee is 22 inches wide and 29 ¼ inches long: large is the closer match on those two measurements.
  • If your reference tee is 20 ¼ inches wide and 28 inches long: medium is the closer match.
  • If you are between them: large adds 1 ¾ inches of flat width and 1 ¼ inches of length compared with medium. Decide whether you want that extra room and coverage together.

Matching width and length is a starting point, not a guarantee of identical fit. Shoulder shape, sleeves, and fabric can change how a tee sits. This pocket tee already has a relaxed fit, so check the numbers before automatically sizing up.

Does pre-shrunk mean the size can never change?

The Eyes Low Pocket T-shirt is listed as garment-dyed, pre-shrunk, 100% ring-spun cotton. Pre-shrunk does not promise that the measurements will never change. Follow the garment's care label, and choose the size for the fit you want now rather than buying a larger tee with plans to shrink it.

Check the product page again before ordering, since the live guide is the place to confirm current measurements. Keep your measuring tape relaxed, your units consistent, and your standards high.

Save your numbers for next time

Keep a short note with your reference tee’s width, length, tag size, and the measurement method. Add a sentence about the fit: “roomy through the chest” or “hem lands just below the waistband.” If the product page doesn’t provide the measurements you need, ask before buying.

Once you find the shape you like, building outfits gets easier. For ideas on putting your pieces to work, read Your Daily Rotation Deserves an Upgrade. Find your fit, then take the afternoon as it comes.