I found a way to do it! You remember the place where you find Margarita? Yea it's locked but there is a way to climb from a wall, get inside and it lead to sewers, that lead to the cat's school part 2 trousers, I found it when I was trying to find a way to complete the Whoreson junior quest without any failed objective, since it required to find a secret passage but it was locked from the Smith's house. For the Whoreson, there's some lock doors on the path but I use a mod that add a code in the console commands and make it possible to unlock any door.