So what is the best answer?

It depends on how strictly you define a hole. If you only count the large torn areas, you may say 2. If you count both sides of those tears, you may say 4. If you include the natural openings of the skirt and possibly the drawstring holes, your answer can rise even more. That is what makes the puzzle interesting: it is not just testing your eyes, but your reasoning.

In the end, the real challenge is not the skirt.

It is how your mind chooses to count what it sees.