How to choose your T-shirt and shirt size without trying them on

Choosing a top online is about more than ordering your usual S, M or XL. The same letter can mean different amounts of room depending on the cut and the model. Start by comparing useful measurements, then decide how much ease you want. A few minutes with a garment you already know can help you ask precise questions before confirming your choice, rather than relying on the size printed on a label.

Start with a garment that really fits you

Choose a T-shirt or shirt you enjoy wearing, from the same clothing category as your intended purchase. A fitted shirt is not a useful reference for an oversized T-shirt. Lay it flat, fasten the buttons if needed and smooth the fabric without stretching it. Keep this reference garment nearby while you compare the available information. Its familiar fit helps give the measurements meaning.

Use a flexible tape measure instead of estimating by eye. Save the results on your phone with the garment’s name and cut. Build a personal reference using chest width, total length, shoulder width and sleeve length. A photograph of the garment laid flat can help explain your preferences to customer service, but it does not replace actual dimensions.

Measure the areas that affect comfort

Measure chest width in a straight line from one underarm to the other. This flat measurement is half the garment’s circumference; it is not your body’s chest measurement. If a chart gives the full circumference, multiply the flat width by two before comparing. Always check which measurement is shown: a width of 50 cm does not mean a full chest circumference of 50 cm.

Measure length from the highest shoulder point down to the hem. On a garment with a conventional shoulder seam, measure shoulders between the seams. A dropped shoulder uses a different construction, so look at the overall volume and sleeve length as well. These differences can explain apparently unusual measurements without meaning that the stated size is wrong. Compare the method as carefully as the number.

Give shirts a closer check

A shirt with less stretch leaves less room for movement. Pay attention to the chest, stomach and arms. If you wear it buttoned, check that the buttons lie flat on your reference shirt. Lines pulling out from the buttons, or tension when you sit, suggest that you need more ease. A shirt should remain comfortable in ordinary positions, not only when you stand still.

For long sleeves, compare measurements taken in the same way. A length measured from the shoulder is not interchangeable with one measured from the centre of the back. If you plan to fasten the top button, ask for the collar measurement. An overshirt worn open allows different preferences, but you still need freedom around the shoulders and elbows.

Separate size from cut

Size describes dimensions; cut describes how those dimensions are distributed. Straight, fitted and loose garments can hang differently even with the same letter on the label. Going up a size does not always turn a fitted design into an oversized one. It can leave sleeves and length larger than you wanted while the garment still follows its original shape.

Describe the result you want: a close-fitting T-shirt, everyday comfort or room for another layer. Length matters when you tuck in a shirt, while the hem shape becomes more visible when you wear it untucked. Base the decision on how you will actually wear the garment, rather than on a trend or a flattering camera angle.

Use height and weight as clues

Height and weight can guide a recommendation, but two people with the same figures can have different shoulders and chest measurements. Body shape and how weight is distributed also matter. Generic charts and recommendation tools provide a starting point. Whenever a guide is available for the particular product, use it before a general chart.

If you fall between sizes, think about where clothes usually restrict you. Broad shoulders, upper arms or movement while seated may call for more room. On an already loose model, the smaller option may suit your preference. When reliable measurements are missing, ask for them. Presenting a guess as a precise recommendation does not make it more accurate.

Check the material and care information

Read the composition when it is provided. Stretch can help movement, but it does not make an unsuitable amount of room comfortable. Do not assume a garment will shrink or stretch exactly like another item you own. Construction, material and care all influence the result. Follow the label and choose a suitable size from the outset, rather than counting on washing to change it.

Use this short checklist before confirming

• Choose a reference from the same clothing category with a similar cut.
• Check whether the chart shows a flat width or a full circumference.
• Compare chest, length, shoulders and sleeves using the same method.
• Use the product’s own guide before a generic size chart.
• Select the right colour and size, then check the order summary.

If information is missing, keep your reference garment handy and send its useful measurements to customer service. Chest width and length are easier to compare than a question such as “Does it fit normally?” You can also consult our size guide to review the method. Confirm only once the selected variant matches the choice you intended to make.

Would you like to compare a measurement before choosing? Contact the L’Hayba team with your question.