This one is pretty obvious on how to get normally. Most people probably know that they can use things like chairs and shirts to fill in for players. However my tip would be to use the game that has you mimicking star constellations (while picking games it's the one that is a telescope). When the game starts make sure it's in pause mode (so it doesn't switch games on you) by pressing "A". In this mode each "player" found by the game will have a wire-frame outline on screen. This allows you to see which of your stand-ins are working and which are not.
As for setting up the chairs with shirts, I had better luck holding the shirt in front of me and lowering myself down behind the chair. Eventually sinking out of sight behind the chair leaving the shirt visible. Most times that caused the shirt to continue to be picked up as a player.