How many holes does this t-shirt have? Only one in seven people find the right answer

In this type of puzzle, you focus on what you see first. We forget that the holes go through the fabric from one side to the other. And this is precisely where the trap closes.
Let’s take the time to count together

Let’s start calmly, without rushing.

A hole for the head
Two arm holes
A hole at the bottom for the body

So far, everyone agrees. So we get to four holes. It is often at this stage that many stop… or they add the two holes visible on the front of the t-shirt (in the challenge art), which brings them to six.

But this reasoning remains incomplete.
The detail that almost everyone forgets

A hole, by definition, passes through a material. If you can see through it, it means that there is an entrance and an exit. In other words, a visible hole at the front also exists at the back.