are dressed almost identically. Each person is wearing a white button-up shirt, a dark blue tie, a blue-and-white plaid skirt, white socks, and black shoes.
Because the clothing is so similar, your eyes naturally begin grouping everyone together.
That is exactly what makes the puzzle challenging.
When people are dressed alike, our brains tend to focus on the similarities rather than the differences. You might look at the hairstyles and immediately think they are all girls. You might look at the skirts and assume the answer must be a trick.
