While certain clothing can shrink, we do not anticipate underwear to do so. However, occasionally we find that the underwear has shrunk after washing and drying. We could be interested in learning whether underpants can shrink over time as a result.

The majority of underwear shrinks over time. This is so because underwear is constructed of materials that can shrink. Underwear made of cotton, wool, silk, rayon, and linen will all eventually shrink.

In this article, We’ll be explaining why underwear shrinks

Does Underwear Shrink

Fabrics can shrink for a variety of reasons, but the three main factors that affect whether a fabric will shrink or not are its fibre structure, added moisture, and heat and agitation.

The structure of the fibres used to create the fabric for a particular garment is referred to as fibre structure. Shrinkage is more likely to happen to natural fibres. The contact between the fibres in the fabric is tightened when these strands are exposed to a lot of heat, which causes shrinking.

Since their fibres need a lot of heat to alter in structure, synthetic textiles like polyester and nylon resist shrinking.

Natural fibre materials, like silk, cotton, and linen, are more likely to exhibit relaxation shrinkage when exposed to excess moisture. In particular, natural fibres have a tendency to inflate when exposed to water, which causes them to shrink.

Using a washing machine to shrink underwear

This technique involves shrinking the underwear by utilizing the heat and moisture produced by the washing machine's wash cycle. Here's how you shrink your underpants in the washer.

1. Don the underclothes to determine the necessary shrink size.

2. To learn what material was used to produce the underwear, read the care tag. Since natural fibres shrink quickly, you run a greater risk of shrinking your underwear in the laundry if you wear cotton, wool, or other natural fabric underwear.

3. Select the high-water setting on the washing machine.

4. Place the underwear in the washer.

5. Start the washer and wait until the wash cycle is finished.

6. Air dry the underwear out of the direction of the sun.

7. Put on the underwear to check that it has shrunk to the desired size. Repeat the process if necessary.

Even though this approach works well for shrinking underwear, I don't like it because you have to wash the underwear by themselves in the washer, which wastes a lot of energy. The clothes may shrink if you washed other items of clothing that you did not wish to shrink.

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Shrinking Underwear With Hot Boiling Water

This is how hot, boiling water is used to shrink underwear.

1. Bring water to a boil in a pot. When bubbles start to appear, the water is ready.

2. Submerge your underpants in the scalding water using metal tongs or a wooden spoon. Ensure that the bra has been completely immersed in the hot water.

3. After the heat source has been turned off, let the underwear in the water for 5 to 10 minutes.

4. After letting the underwear cool, wring out any remaining water and air dry them on a clothesline.

5. Try on the underwear after it has dried to see if you got the right size. Repeat the technique if you need the underwear to shrink any further.

Shrinking A Big Underwear

If your underwear is too big, it will not be able to support the bottom since it will be loose-fitting. It is shameful, especially when among people, that you will occasionally be obliged to put it in place.

If your underwear is too big, you can shrink it to make it smaller and more fitting. Your underwear will shrink most effectively if you soak it in boiling water for 5 to 10 minutes. The large underwear can also be shrunk using a washing machine and dryer

It could be difficult to shrink your underwear if it is made of natural fibres that are resistant to shrinking. In this situation, you ought to think about altering the underwear size by sewing.

How To Shrink Clothes (Generally)

How To Shrink Elastic Underwear

  1. By Sewing

This technique, which involves cutting the excess elastic fabric and sewing it back to shrink it and reduce the measurement, is straightforward and less dangerous.

This technique can be used to tighten up loose underwear waistbands. Be aware that a loose waistline can be a sign that your underwear needs to be replaced. Throw away the underpants and get new ones in such situations.

  1. With Heat

This technique involves heating the elastic such that the strain on the fibres will cause them to revert to their initial configuration.

Soaking the elastic in hot water is one method of only shrinking the elastic. You placed boiling water in a basin. The elastic is next placed in hot water for 5 to 10 minutes. When the underwear has dried, try them on to see if the elastic has shrunk to the correct size. You can repeat the procedure if necessary.

The use of iron is the alternative way of shrinking elastic. Use a hot iron to iron the waistline for a few minutes while using this technique. You must take extra care not to damage the elastic when ironing it.

Determine whether the elastic has shrunk after ironing for a while. In the event that you don't notice any shrinkage, the elastic is probably worn out. In this situation, you must buy new underwear.

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Will Elastic Underwear Shrink In Wash?

Since elastic is a stretch fabric that can stretch, it provides a great fit. When making clothing, the makers usually make sure that the elastic has been treated to prevent shrinking or stretching.

High heat and moisture, though, could cause the elastic to shrink and likely damage it. You must use the proper setting if you want to shrink elastically in the washer. The elastic will be destroyed if too much heat is applied.


Cumulative shrinkage occurs when clothing is heated and agitated, typically during washing and drying. During washing and drying, the normally tightly woven fibres in this form of shrinkage release their tension, which causes shrinking.

Depending on the fibres used to construct the underwear, it may shrink over time. Particularly, undergarments manufactured from natural materials, such as cotton, linen, silk, and wool, will shrink more with time than those made from artificial materials, such as polyester and nylon.

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