A confusing puzzle about guys who decided to dress up for a party

In order not to get confused, let's create a table and enter all known data from the problem statement into it.

1. Lesha's trousers are green, and a jacket of a different color - put a plus and a dash in the corresponding fields. Therefore, Sasha and Pasha's pants can no longer be green, and their brother's - red or blue. Let us note this in the table.

2. Pasha's trousers and jacket were not red - we put dashes in the corresponding fields.

It turns out that only Sasha can have red pants, which means that Pasha has blue ones. The right side of the table is filled in, we have set the colors of the guys' pants.

3. Now let's deal with the jackets. The color of Sasha's jacket matches the color of his trousers - red. Lesha's jacket, therefore, cannot be red, and also, according to the condition of the problem, it is not green. Let's enter this data into table.

Now it's easy to identify the owner of the green jacket: it's Pasha. In this case, Lyosha is dressed in a blue jacket.

Answer: Sasha went to the party in a red suit, Lyosha in a blue jacket and green trousers, Pasha in a green jacket and blue pants.