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How to Stretch a Polyester T-shirt in Two Easy Ways

So you’ve got yourself a polyester t-shirt that doesn’t quite fit. It’s an annoyance, for sure, but it’s not the end of the world. There are things that can be done to stretch your polyester garment back into shape, and we are here to walk you through your options. 

Since our goal is to re-shape the t-shirt and keep it in the best condition possible, we need to make sure we don’t do any damage. Understanding what polyester is, what it likes, and what it doesn’t like, is how we can avoid hurting it. So before we get to stretching, let’s get our research done. After that, I will give you a step-by-step walkthrough on how to stretch polyester fabric.

What is Polyester Fabric?

Polyester is a synthetic material and a type of plastic. The two main uses for polyester material are textiles and plastic bottles. Plastic bottles can actually be recycled into polyester fabric.

As a textile, polyester fabrics are strong and very water-resistant, which makes sense when you think of it as cloth woven from superfine threads of plastic. Its biggest drawback is its lack of breathability: it cannot absorb water very well, which means the fabric clings to our bodies when we sweat.

More than half of all retail clothes in the world contain polyester, and a good proportion of those are mixed with natural fiber as well. Poly-cotton, for example, is a very common blend of polyester and cotton fabric, often used by clothing manufacturers all around the globe. Polyester gives the fabric strength plus water and wrinkle resistance, while the wool fibers provide the softness, stretchiness, and breathability of a cotton t-shirt. 

It’s important to know the ratio of polyester to natural fibers in your shirt because the results of stretching will vary depending on the answer, as the stretch factor can be wildly different depending on the blend. T-shirts made out of 100% polyester barely stretch at all, and even if you do manage to stretch them, they don’t stay stretched for long. A polyester-cotton blend, however, will likely stretch more easily and the effects will last longer. 

The type of fabric will always be written right on the label, so make sure to have a look before you start stretching. Knowing exactly what you’re working with will help you know what kind of results to expect, and how much strength to put into your stretching. 

Is Polyester Easy to Stretch?

Unfortunately, the answer is no: polyester is not very easy to stretch. You’ll need to gather ingredients and tools, set aside a good amount of time, and be ready to use your muscles. And unfortunately, the results can be a little disappointing considering the amount of effort. 

You will be able to achieve the shape you want, whether it’s making a t-shirt bigger than its intended size, or restoring a shrunken t-shirt to its original form, but the effects will not last forever. In fact, if the shirt in question is 100% polyester, the effects may only last one wear. Time, or a round in the washing machine, will return the t-shirt to its original shape.

So, if you’re looking for a quick and permanent fix, you may have to buy a new t-shirt with a lower polyester count. But if you need to wear the t-shirt tomorrow, and don’t want to go shopping today, then we’re here to teach you how to stretch polyester fabric.

How to Stretch Polyester T-shirt Step-by-Step

There are two methods when it comes to stretching polyester shirts. We will go over both, so choose the one that suits you best.

First Method – Warm water soak with conditioner

This is probably the most effective method of stretching polyester clothing, and that applies to both 100% polyester and polyester blends. All you need is a sink or sink-like tub, warm water, and some hair conditioner. Baby shampoo or fabric softener can also be used.

Step 1. Prepare the hot water bath

In order to soak your polyester clothes, you need a container it can fit in. A sink or a bath, or any kind of box that can hold water will do. Make sure whatever you use is clean, because the t-shirt will be worn afterward without putting it in the washing machine.

Fill the container with hot water. The temperature should be nice and warm, but definitely not too hot to touch. If you overheat polyester fabric it can warp out of shape, making matters worse. You don’t need to measure the amount of water exactly, but keep an eye on the approximate amount.

Step 2. Add the softener

Next, you can add your softener of choice. It doesn’t really matter which you choose, so just use whatever you have on hand: hair conditioner, baby shampoo, or fabric softener. 

You should add a few drops (around one tablespoon) of softener or hair conditioner per one liter of water. This should be enough to help to soften the polyester fibers in your shirt, but not overdo it and leave residue on the fabric. Mix the water with your hand to make sure there are no large lumps of softener. 

Step 3. Soak your t-shirt for 20 – 30 minutes

The warmth of the water and the softener will work together to soften the polyester fibers in your shirt and make them more susceptible to stretching. Once you have submerged your t-shirt and moved it around a little to help let the warm water get into all the nooks and crannies, leave it to soak for around 20 minutes. 

You can leave it a little longer than 20 minutes if you want, but a good time to take it out is before the water has completely cooled. This will normally take about half an hour (depending on the amount of water). The heat is an important factor in the process, so once it’s gone, leaving it longer won’t do much good anyway and won’t result in additional stretchiness.

Step 4. Remove excess water

Now it’s time to take your t-shirt out of the soaking bath. Before you do the stretching, you need to get rid of all the warm water. You want the t-shirt to be slightly damp, not dripping. 

For this step, it is important to know whether your shirt is 100% polyester, or a blend of polyester and natural fibers. If it’s 100% polyester it will be quite strong, and you can twist and pull and squeeze that t-shirt all you want to get the water out.

However, if your shirt has a blend of natural fibers, it will be a lot more delicate. Squeezing the water out is safer than twisting and wringing the fabric, as it might permanently warp the shape of the shirt. 

Step 5. Stretch your polyester t-shirt

Now it’s time for the main event — the stretching! The only rule to remember here is in keeping with the previous step: if your t-shirt is 100% polyester you can be rough, but if it’s a polyester blend, you should be a little more delicate.

With that in mind, the exact stretching technique is up to you. You can grab the edges of the t-shirt and pull, or you can put your arms inside and move them outwards to stretch the torso section of the shirt equally.

You can also stretch the collar and the sleeves in the same way. Stretching and relaxing in quick succession is a good tactic and makes for a better option than endlessly pulling in one direction. Focusing on just one direction could result in a tear if you put too much strength into it. If your arms get tired, you could even put your legs inside the t-shirt and stretch it that way.

There’s no set amount of time you need to dedicate to this step — the job is done when you are happy with the result. If it’s difficult to judge by eye, then you can just try the shirt on and see how the fit is.

Step 6. Dry the t-shirt

The most important rule of this step is: do not start a drying cycle! High heat will shrink those fibers right back to their original size. The goal is to keep the t-shirt from shrinking while it dries, and this can be done through two methods: hanging the shirt or using weights. 

Hanging the shirt up to air dry will utilize gravity and the t-shirt’s own weight to pull it down and minimize shrinkage. It’s a less heavy-handed method, and better suited to shirts made with a polyester blend. 

The other method is to put a towel on a flat surface to absorb excess water and lay the shirt across it. You can then use a number of flat heavy objects, such as books or pots filled with water, to hold the edges of the t-shirt in place and avoid any shrinking. 

This method is best for 100% polyester clothing as it will need something a little stronger than its own weight to stop it from shrinking. Pure 100% polyester also dries pretty quickly, so even when spread out on the floor, it will not take long to dry. Once one side appears dry, flip the t-shirt over onto a fresh towel to make sure it dries on both sides. Don’t forget to re-apply the weights after you flipped the garment.

Step 7. Wear the stretched t-shirt

Once your shirt is dry, it is ready to be worn! It should fit perfectly now, and even smell extra pleasant due to the softener. 

Just remember that the effects won’t last forever, and duration will depend on a number of factors including the ratio of polyester in the fabric and the extent to which it was stretched. 

With a poly-blend, you can hope to wear the garment a few times or even wash it in the washing machine once before the t-shirt returns to normal, but with 100% polyester clothing, the effects may not even last a full 24 hours. 

Second Method – Molding the t-shirt to your body

Firstly, follow steps 1-4 of the first method: the warm water soak and removal of excess water are exactly the same. 

This method, although effective, is not pleasant — it requires you to wear wet clothes. This method is perfect for a shirt that is currently too small for you to wear, but you do still want a relatively tight fit.

Instead of creating a potentially baggy fit by pulling it all over the place with your hands, you can instead just squeeze yourself into the wet shirt while its polyester fibers are nice and softened, and let it dry to the shape of your body. 

Polyester is not strong enough to continue shrinking even when your body is in the way, so you can use this method without fear of having your circulation cut off by evil polyester clothes! But yes, it does mean you have to sit around in your house wearing a cold damp t-shirt for a while. Luckily, polyester dries very quickly, so it shouldn’t take too long. Make sure you’re in a warm room so that you don’t get too cold while wearing the wet fabric.

Can You Damage Your Polyester T-shirt When Stretching?

If the shirt is made of 100% polyester, it will be really strong and quite difficult to damage. You could stand on the edge of one end of your t-shirt, grab the opposite end and pull really hard, but it still won’t hurt the fabric — as long as you’re not strong enough to tear it, that is.

Blends of polyester and natural fibers, however, can be far more delicate. It is better not to wring and twist a poly-blend when getting rid of excess water because it could permanently warp the fabric. It is also better to stretch a poly-blend by putting your arms inside the t-shirt and stretching it outwards. This applies a more even amount of strain across the garment instead of grabbing small sections with your hands and pulling.

Stretching Polyester – FAQs

If you have any additional questions about polyester material, we’re here to answer them. Whether your fabric stretched properly or not, make sure you check out this section to remedy the all-too-common problem of a too small t-shirt.

1. Can you stretch 100% polyester?

Yes, but the effects don’t last forever. The strength and water-resistant nature of polyester make it difficult to soften the fibers and therefore difficult to stretch. By soaking a 100% polyester t-shirt in a bath of warm water and hair conditioner/fabric softener, it is possible to stretch and reshape the t-shirt to some extent. The key drawback to stretching clothes made out of 100% polyester is that the effects will most likely only last for one wear. Additionally, if you need the shirt to be significantly bigger than it is, you may not be able to successfully stretch it to your desired size. 

2. Can you permanently stretch polyester t-shirts?

No. A successfully stretched shirt will only stay stretched for a short period of time. A polyester blend may last a few days or a few wears, and a 100% polyester t-shirt will likely only stay stretched for around one day. One way or another, it will always return to its original size. However, polyester can be permanently warped out of shape if you stretch it too far and damage the fabric, or if it is subjected to high temperatures. This does not count as successful stretching though, and it will not look good, and the t-shirt will lose its desired fit.

3. How long does it take to stretch a polyester t-shirt?

The most effective method of stretching a polyester t-shirt involves soaking the shirt in warm water, stretching it, and then letting it air dry. The whole process can take a few hours depending on the weather conditions in which the t-shirt is left to dry. Tumble dryers cannot be used to speed things up, so having the time to let the t-shirt dry by itself is important.

4. How often can a polyester t-shirt be stretched?

You can stretch polyester quite often without any danger of damage due to its strength. The method of soaking your t-shirt and molding it to your body (i.e letting it dry while you are wearing it) is an especially low-risk technique, and you could definitely do it every day if you needed to. 


Stretching polyester isn’t the easiest or the quickest thing in the world, but it is possible and it could let you get further use out of a t-shirt you’re not quite ready to say goodbye to yet.

Everything you need to safely and effectively stretch your t-shirt will probably already be ready and waiting in your house, and if not, it’s easy to get. The task of stretching your polyester t-shirt is not labor-intensive. The actual physical stretching only takes a few minutes, and if you really can’t spare the time, you can just use the dry-while-wearing technique instead (Method 2 in our guide).

Although the effects won’t last forever, they will last for at least one day. This should cover nearly any activity you may have planned, but once the day is up and you put the shirt in the wash, you’ll need to stretch it again when you want to wear it.

If you’re worried about destroying your shirt, you likely don’t need to feel concerned. Polyester is super strong and very durable, so as long as you’re not using excessive force, it’s very unlikely that the t-shirt will get damaged. Bearing all of this in mind, it is up to you to decide whether stretching your t-shirt is worth it, or if it’s just time for a shopping trip and a new t-shirt.

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