Why is this puzzle so tricky? Our brains tend to count only the most obvious openings. But you have to think about the entire t-shirt:
The neck opening.
Both rounds.
The opening at the bottom of the t-shirt.
The large holes are visible in the fabric.
Upon closer inspection, six holes can be seen in the fabric. Since these holes go all the way through the t-shirt, they are visible through the cardboard placed behind it.
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