Among the viral styling videos that run through Tik Tok, this week a tutorial stands out that shows that to find the correct size of pants it is not necessary to try them on. This is demonstrated in less than a minute by an influencer who calls herself ‘ierapaperlight’ on the social network.

The trick is not new and in fact, as a user explains in one of the comments, dressmakers have used it since ancient times: “My mother was an old dressmaker and she also knew the trick. I had forgotten.”

In this tutorial, which has already accumulated more than 11,000 likes, the influencer explains that half of the waist circumference measures the same as the neck circumference.

Thus, if the waist of a pair of jeans is wrapped around the neck and the loops on the sides touch, it means that the cut of the pants will fit around the waist.

This simple tip makes purchasing online easier, for example, by checking the measurements of each size with a measuring tape, but above all it is useful in a physical store. With a simple gesture you can avoid the fitting room queue and go directly to the checkout.